curl --request PUT \
  --url https://{tenant}/tyk/apis/oas/{apiID} \
  --header 'Content-Type: application/json' \
  --header 'X-Tyk-Authorization: <api-key>' \
  --data '
{
  "components": {
    "securitySchemes": {
      "bearerAuth": {
        "description": "The API Access Credentials",
        "scheme": "bearer",
        "type": "http"
      }
    }
  },
  "info": {
    "description": "This is a sample OAS.",
    "title": "OAS Sample",
    "version": "1.0.0"
  },
  "openapi": "3.0.3",
  "paths": {
    "/api/sample/users": {
      "get": {
        "operationId": "getUsers",
        "responses": {
          "200": {
            "content": {
              "application/json": {
                "schema": {
                  "items": {
                    "properties": {
                      "name": {
                        "type": "string"
                      }
                    },
                    "type": "object"
                  },
                  "type": "array"
                }
              }
            },
            "description": "fetched users"
          }
        },
        "summary": "Get users",
        "tags": [
          "users"
        ]
      }
    }
  },
  "security": [
    {
      "bearerAuth": []
    }
  ],
  "servers": [
    {
      "url": "https://localhost:8080"
    }
  ],
  "x-tyk-api-gateway": {
    "info": {
      "name": "user",
      "state": {
        "active": true
      }
    },
    "server": {
      "listenPath": {
        "strip": true,
        "value": "/user-test/"
      }
    },
    "upstream": {
      "url": "https://localhost:8080"
    }
  }
}
'

import requests

url = "https://{tenant}/tyk/apis/oas/{apiID}"

payload = {
    "components": { "securitySchemes": { "bearerAuth": {
                "description": "The API Access Credentials",
                "scheme": "bearer",
                "type": "http"
            } } },
    "info": {
        "description": "This is a sample OAS.",
        "title": "OAS Sample",
        "version": "1.0.0"
    },
    "openapi": "3.0.3",
    "paths": { "/api/sample/users": { "get": {
                "operationId": "getUsers",
                "responses": { "200": {
                        "content": { "application/json": { "schema": {
                                    "items": {
                                        "properties": { "name": { "type": "string" } },
                                        "type": "object"
                                    },
                                    "type": "array"
                                } } },
                        "description": "fetched users"
                    } },
                "summary": "Get users",
                "tags": ["users"]
            } } },
    "security": [{ "bearerAuth": [] }],
    "servers": [{ "url": "https://localhost:8080" }],
    "x-tyk-api-gateway": {
        "info": {
            "name": "user",
            "state": { "active": True }
        },
        "server": { "listenPath": {
                "strip": True,
                "value": "/user-test/"
            } },
        "upstream": { "url": "https://localhost:8080" }
    }
}
headers = {
    "X-Tyk-Authorization": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.put(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PUT',
  headers: {'X-Tyk-Authorization': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    components: {
      securitySchemes: {
        bearerAuth: {description: 'The API Access Credentials', scheme: 'bearer', type: 'http'}
      }
    },
    info: {description: 'This is a sample OAS.', title: 'OAS Sample', version: '1.0.0'},
    openapi: '3.0.3',
    paths: {
      '/api/sample/users': {
        get: {
          operationId: 'getUsers',
          responses: {
            '200': {
              content: {
                'application/json': {
                  schema: {items: {properties: {name: {type: 'string'}}, type: 'object'}, type: 'array'}
                }
              },
              description: 'fetched users'
            }
          },
          summary: 'Get users',
          tags: ['users']
        }
      }
    },
    security: [{bearerAuth: []}],
    servers: [{url: 'https://localhost:8080'}],
    'x-tyk-api-gateway': {
      info: {name: 'user', state: {active: true}},
      server: {listenPath: {strip: true, value: '/user-test/'}},
      upstream: {url: 'https://localhost:8080'}
    }
  })
};

fetch('https://{tenant}/tyk/apis/oas/{apiID}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{tenant}/tyk/apis/oas/{apiID}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'components' => [
        'securitySchemes' => [
                'bearerAuth' => [
                                'description' => 'The API Access Credentials',
                                'scheme' => 'bearer',
                                'type' => 'http'
                ]
        ]
    ],
    'info' => [
        'description' => 'This is a sample OAS.',
        'title' => 'OAS Sample',
        'version' => '1.0.0'
    ],
    'openapi' => '3.0.3',
    'paths' => [
        '/api/sample/users' => [
                'get' => [
                                'operationId' => 'getUsers',
                                'responses' => [
                                                                '200' => [
                                                                                                                                'content' => [
                                                                                                                                                                                                                                                                'application/json' => [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                'schema' => [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                'items' => [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                'properties' => [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                'name' => [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                'type' => 'string'
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                ]
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                ],
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                'type' => 'object'
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                ],
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                'type' => 'array'
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                ]
                                                                                                                                                                                                                                                                ]
                                                                                                                                ],
                                                                                                                                'description' => 'fetched users'
                                                                ]
                                ],
                                'summary' => 'Get users',
                                'tags' => [
                                                                'users'
                                ]
                ]
        ]
    ],
    'security' => [
        [
                'bearerAuth' => [
                                
                ]
        ]
    ],
    'servers' => [
        [
                'url' => 'https://localhost:8080'
        ]
    ],
    'x-tyk-api-gateway' => [
        'info' => [
                'name' => 'user',
                'state' => [
                                'active' => true
                ]
        ],
        'server' => [
                'listenPath' => [
                                'strip' => true,
                                'value' => '/user-test/'
                ]
        ],
        'upstream' => [
                'url' => 'https://localhost:8080'
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-Tyk-Authorization: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://{tenant}/tyk/apis/oas/{apiID}"

	payload := strings.NewReader("{\n  \"components\": {\n    \"securitySchemes\": {\n      \"bearerAuth\": {\n        \"description\": \"The API Access Credentials\",\n        \"scheme\": \"bearer\",\n        \"type\": \"http\"\n      }\n    }\n  },\n  \"info\": {\n    \"description\": \"This is a sample OAS.\",\n    \"title\": \"OAS Sample\",\n    \"version\": \"1.0.0\"\n  },\n  \"openapi\": \"3.0.3\",\n  \"paths\": {\n    \"/api/sample/users\": {\n      \"get\": {\n        \"operationId\": \"getUsers\",\n        \"responses\": {\n          \"200\": {\n            \"content\": {\n              \"application/json\": {\n                \"schema\": {\n                  \"items\": {\n                    \"properties\": {\n                      \"name\": {\n                        \"type\": \"string\"\n                      }\n                    },\n                    \"type\": \"object\"\n                  },\n                  \"type\": \"array\"\n                }\n              }\n            },\n            \"description\": \"fetched users\"\n          }\n        },\n        \"summary\": \"Get users\",\n        \"tags\": [\n          \"users\"\n        ]\n      }\n    }\n  },\n  \"security\": [\n    {\n      \"bearerAuth\": []\n    }\n  ],\n  \"servers\": [\n    {\n      \"url\": \"https://localhost:8080\"\n    }\n  ],\n  \"x-tyk-api-gateway\": {\n    \"info\": {\n      \"name\": \"user\",\n      \"state\": {\n        \"active\": true\n      }\n    },\n    \"server\": {\n      \"listenPath\": {\n        \"strip\": true,\n        \"value\": \"/user-test/\"\n      }\n    },\n    \"upstream\": {\n      \"url\": \"https://localhost:8080\"\n    }\n  }\n}")

	req, _ := http.NewRequest("PUT", url, payload)

	req.Header.Add("X-Tyk-Authorization", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.put("https://{tenant}/tyk/apis/oas/{apiID}")
  .header("X-Tyk-Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"components\": {\n    \"securitySchemes\": {\n      \"bearerAuth\": {\n        \"description\": \"The API Access Credentials\",\n        \"scheme\": \"bearer\",\n        \"type\": \"http\"\n      }\n    }\n  },\n  \"info\": {\n    \"description\": \"This is a sample OAS.\",\n    \"title\": \"OAS Sample\",\n    \"version\": \"1.0.0\"\n  },\n  \"openapi\": \"3.0.3\",\n  \"paths\": {\n    \"/api/sample/users\": {\n      \"get\": {\n        \"operationId\": \"getUsers\",\n        \"responses\": {\n          \"200\": {\n            \"content\": {\n              \"application/json\": {\n                \"schema\": {\n                  \"items\": {\n                    \"properties\": {\n                      \"name\": {\n                        \"type\": \"string\"\n                      }\n                    },\n                    \"type\": \"object\"\n                  },\n                  \"type\": \"array\"\n                }\n              }\n            },\n            \"description\": \"fetched users\"\n          }\n        },\n        \"summary\": \"Get users\",\n        \"tags\": [\n          \"users\"\n        ]\n      }\n    }\n  },\n  \"security\": [\n    {\n      \"bearerAuth\": []\n    }\n  ],\n  \"servers\": [\n    {\n      \"url\": \"https://localhost:8080\"\n    }\n  ],\n  \"x-tyk-api-gateway\": {\n    \"info\": {\n      \"name\": \"user\",\n      \"state\": {\n        \"active\": true\n      }\n    },\n    \"server\": {\n      \"listenPath\": {\n        \"strip\": true,\n        \"value\": \"/user-test/\"\n      }\n    },\n    \"upstream\": {\n      \"url\": \"https://localhost:8080\"\n    }\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{tenant}/tyk/apis/oas/{apiID}")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Put.new(url)
request["X-Tyk-Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"components\": {\n    \"securitySchemes\": {\n      \"bearerAuth\": {\n        \"description\": \"The API Access Credentials\",\n        \"scheme\": \"bearer\",\n        \"type\": \"http\"\n      }\n    }\n  },\n  \"info\": {\n    \"description\": \"This is a sample OAS.\",\n    \"title\": \"OAS Sample\",\n    \"version\": \"1.0.0\"\n  },\n  \"openapi\": \"3.0.3\",\n  \"paths\": {\n    \"/api/sample/users\": {\n      \"get\": {\n        \"operationId\": \"getUsers\",\n        \"responses\": {\n          \"200\": {\n            \"content\": {\n              \"application/json\": {\n                \"schema\": {\n                  \"items\": {\n                    \"properties\": {\n                      \"name\": {\n                        \"type\": \"string\"\n                      }\n                    },\n                    \"type\": \"object\"\n                  },\n                  \"type\": \"array\"\n                }\n              }\n            },\n            \"description\": \"fetched users\"\n          }\n        },\n        \"summary\": \"Get users\",\n        \"tags\": [\n          \"users\"\n        ]\n      }\n    }\n  },\n  \"security\": [\n    {\n      \"bearerAuth\": []\n    }\n  ],\n  \"servers\": [\n    {\n      \"url\": \"https://localhost:8080\"\n    }\n  ],\n  \"x-tyk-api-gateway\": {\n    \"info\": {\n      \"name\": \"user\",\n      \"state\": {\n        \"active\": true\n      }\n    },\n    \"server\": {\n      \"listenPath\": {\n        \"strip\": true,\n        \"value\": \"/user-test/\"\n      }\n    },\n    \"upstream\": {\n      \"url\": \"https://localhost:8080\"\n    }\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "action": "modified",
  "key": "e30bee13ad4248c3b529a4c58bb7be4e",
  "status": "ok"
}

{
  "message": "Request APIID does not match that in Definition! For Update operations these must match.",
  "status": "error"
}

{
  "message": "Attempted administrative access with invalid or missing key!",
  "status": "error"
}

{
  "message": "API not found",
  "status": "error"
}

{
  "message": "file object creation failed, write error",
  "status": "error"
}