curl --request GET \
  --url https://{tenant}/api/certs/{certId}/apis \
  --header 'Authorization: Bearer <token>'

{
  "cert_id": "5e9d9544a1dcd60001d0ed208edce514c2d0a866063550c64d6c90be99d01561ac5aa7e82b8610b7e273d37d",
  "pages": 1,
  "apis": [
    {
      "api_id": "663a4ed9b6be920001b191ae",
      "name": "First API",
      "usage_type": [
        "client",
        "upstream"
      ],
      "tyk_api_type": "Tyk OAS"
    },
    {
      "api_id": "663a5ed9b6be920001b191ae",
      "name": "Second API",
      "usage_type": [
        "server"
      ],
      "tyk_api_type": "Tyk OAS"
    }
  ]
}