curl --request POST \
  --url https://{tenant}/api/assets \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "data": {
    "info": {
      "title": "Our Sample OAS",
      "version": "1.0.0"
    },
    "openapi": "3.0.3",
    "paths": {
      "/anything": {
        "post": {
          "operationId": "anythingpost",
          "responses": {
            "200": {
              "description": "post created"
            }
          }
        }
      }
    },
    "x-tyk-api-gateway": {
      "middleware": {
        "global": {
          "cache": {
            "cacheAllSafeRequests": true,
            "enabled": true,
            "timeout": 5
          }
        }
      }
    }
  },
  "description": "My first template",
  "id": "my-unique-template-id",
  "kind": "oas-template",
  "name": "my-template"
}
'

import requests

url = "https://{tenant}/api/assets"

payload = {
    "data": {
        "info": {
            "title": "Our Sample OAS",
            "version": "1.0.0"
        },
        "openapi": "3.0.3",
        "paths": { "/anything": { "post": {
                    "operationId": "anythingpost",
                    "responses": { "200": { "description": "post created" } }
                } } },
        "x-tyk-api-gateway": { "middleware": { "global": { "cache": {
                        "cacheAllSafeRequests": True,
                        "enabled": True,
                        "timeout": 5
                    } } } }
    },
    "description": "My first template",
    "id": "my-unique-template-id",
    "kind": "oas-template",
    "name": "my-template"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    data: {
      info: {title: 'Our Sample OAS', version: '1.0.0'},
      openapi: '3.0.3',
      paths: {
        '/anything': {
          post: {operationId: 'anythingpost', responses: {'200': {description: 'post created'}}}
        }
      },
      'x-tyk-api-gateway': {
        middleware: {global: {cache: {cacheAllSafeRequests: true, enabled: true, timeout: 5}}}
      }
    },
    description: 'My first template',
    id: 'my-unique-template-id',
    kind: 'oas-template',
    name: 'my-template'
  })
};

fetch('https://{tenant}/api/assets', 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}/api/assets",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'data' => [
        'info' => [
                'title' => 'Our Sample OAS',
                'version' => '1.0.0'
        ],
        'openapi' => '3.0.3',
        'paths' => [
                '/anything' => [
                                'post' => [
                                                                'operationId' => 'anythingpost',
                                                                'responses' => [
                                                                                                                                '200' => [
                                                                                                                                                                                                                                                                'description' => 'post created'
                                                                                                                                ]
                                                                ]
                                ]
                ]
        ],
        'x-tyk-api-gateway' => [
                'middleware' => [
                                'global' => [
                                                                'cache' => [
                                                                                                                                'cacheAllSafeRequests' => true,
                                                                                                                                'enabled' => true,
                                                                                                                                'timeout' => 5
                                                                ]
                                ]
                ]
        ]
    ],
    'description' => 'My first template',
    'id' => 'my-unique-template-id',
    'kind' => 'oas-template',
    'name' => 'my-template'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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}/api/assets"

	payload := strings.NewReader("{\n  \"data\": {\n    \"info\": {\n      \"title\": \"Our Sample OAS\",\n      \"version\": \"1.0.0\"\n    },\n    \"openapi\": \"3.0.3\",\n    \"paths\": {\n      \"/anything\": {\n        \"post\": {\n          \"operationId\": \"anythingpost\",\n          \"responses\": {\n            \"200\": {\n              \"description\": \"post created\"\n            }\n          }\n        }\n      }\n    },\n    \"x-tyk-api-gateway\": {\n      \"middleware\": {\n        \"global\": {\n          \"cache\": {\n            \"cacheAllSafeRequests\": true,\n            \"enabled\": true,\n            \"timeout\": 5\n          }\n        }\n      }\n    }\n  },\n  \"description\": \"My first template\",\n  \"id\": \"my-unique-template-id\",\n  \"kind\": \"oas-template\",\n  \"name\": \"my-template\"\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	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.post("https://{tenant}/api/assets")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"data\": {\n    \"info\": {\n      \"title\": \"Our Sample OAS\",\n      \"version\": \"1.0.0\"\n    },\n    \"openapi\": \"3.0.3\",\n    \"paths\": {\n      \"/anything\": {\n        \"post\": {\n          \"operationId\": \"anythingpost\",\n          \"responses\": {\n            \"200\": {\n              \"description\": \"post created\"\n            }\n          }\n        }\n      }\n    },\n    \"x-tyk-api-gateway\": {\n      \"middleware\": {\n        \"global\": {\n          \"cache\": {\n            \"cacheAllSafeRequests\": true,\n            \"enabled\": true,\n            \"timeout\": 5\n          }\n        }\n      }\n    }\n  },\n  \"description\": \"My first template\",\n  \"id\": \"my-unique-template-id\",\n  \"kind\": \"oas-template\",\n  \"name\": \"my-template\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{tenant}/api/assets")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"data\": {\n    \"info\": {\n      \"title\": \"Our Sample OAS\",\n      \"version\": \"1.0.0\"\n    },\n    \"openapi\": \"3.0.3\",\n    \"paths\": {\n      \"/anything\": {\n        \"post\": {\n          \"operationId\": \"anythingpost\",\n          \"responses\": {\n            \"200\": {\n              \"description\": \"post created\"\n            }\n          }\n        }\n      }\n    },\n    \"x-tyk-api-gateway\": {\n      \"middleware\": {\n        \"global\": {\n          \"cache\": {\n            \"cacheAllSafeRequests\": true,\n            \"enabled\": true,\n            \"timeout\": 5\n          }\n        }\n      }\n    }\n  },\n  \"description\": \"My first template\",\n  \"id\": \"my-unique-template-id\",\n  \"kind\": \"oas-template\",\n  \"name\": \"my-template\"\n}"

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

{
  "ID": "my-unique-template-id",
  "Message": "asset created",
  "Meta": "664d86e35715ec0d370bbe11",
  "Status": "success"
}

{
  "Message": "error reading json body.",
  "Meta": null,
  "Status": "Error"
}

{
  "Message": "Not authorised",
  "Meta": null,
  "Status": "Error"
}

{
  "Message": "access denied: You do not have permission to access  /api/assets",
  "Meta": null,
  "Status": "Error"
}

{
  "Message": "Asset ID already exists: 'my-unique-template-id'.",
  "Meta": null,
  "Status": "Error"
}

{
  "Message": "unsupported asset kind: 'oas-templat'.",
  "Meta": null,
  "Status": "Error"
}

{
  "Message": "error adding asset.",
  "Meta": null,
  "Status": "Error"
}