curl --request GET \
  --url https://api.example.com/api/custom-apis/{api_id} \
  --header 'Authorization: Bearer <token>'

{
  "id": 123,
  "user_id": 123,
  "name": "<string>",
  "description": "<string>",
  "url": "<string>",
  "method": "<string>",
  "headers": {},
  "env": {},
  "is_active": true,
  "is_default": true,
  "created_at": "<string>",
  "updated_at": "<string>"
}