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

{
  "api_id": "b84fe1a04e5648927971c0557971565c",
  "auth": {
    "auth_header_name": "authorization"
  },
  "definition": {
    "key": "version",
    "location": "header"
  },
  "name": "Tyk Test API",
  "org_id": "664a14650619d40001f1f00f",
  "proxy": {
    "listen_path": "/tyk-api-test/",
    "strip_listen_path": true,
    "target_url": "https://httpbin.org"
  },
  "use_oauth2": true,
  "version_data": {
    "not_versioned": true,
    "versions": {
      "Default": {
        "name": "Default"
      }
    }
  }
}