curl --request GET \
  --url https://api.prequel.co/import/sources/validate \
  --header 'X-API-KEY: <api-key>'

{
  "is_valid": true,
  "errors": [
    {
      "error_code": "<string>",
      "title": "<string>",
      "message": "<string>",
      "blame": "<string>",
      "documentation_url": "<string>",
      "trace": "<string>"
    }
  ]
}