curl --request GET \
  --url https://{tenant}/tyk/apis/oas/{apiID} \
  --header 'X-Tyk-Authorization: <api-key>'

import requests

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

headers = {"X-Tyk-Authorization": "<api-key>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {'X-Tyk-Authorization': '<api-key>'}};

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 => "GET",
  CURLOPT_HTTPHEADER => [
    "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"
	"net/http"
	"io"
)

func main() {

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

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("X-Tyk-Authorization", "<api-key>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://{tenant}/tyk/apis/oas/{apiID}")
  .header("X-Tyk-Authorization", "<api-key>")
  .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::Get.new(url)
request["X-Tyk-Authorization"] = '<api-key>'

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

{
  "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"
    }
  }
}

{
  "message": "the requested API definition is in Tyk classic format, please use old API endpoint",
  "status": "error"
}

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

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