curl --request GET \
  --url https://thirdparty-sandbox.staging.qonto.co/register/registrations/{registrationId}/files \
  --header 'Authorization: Bearer <token>' \
  --header 'Qonto-Partner-Id: <api-key>' \
  --header 'X-Qonto-Staging-Token: <api-key>'

{
  "files": [
    {
      "registration_files": [
        {
          "id": "d7344200-97d7-44b7-8fc5-9e5fb2f8831b",
          "filename": "document.pdf",
          "filesize_bytes": 981723,
          "url": "https://example-s3-url",
          "created_at": "2021-08-17T12:31:32.689Z",
          "file_type": "organization-deposit-certificate",
          "stakeholder_id": "<string>"
        }
      ],
      "meta": {
        "current_page": 1,
        "next_page": 2,
        "prev_page": null,
        "total_pages": 2,
        "total_count": 27,
        "per_page": 25
      }
    }
  ]
}