Get file upload request details

This GET endpoint is used to get file upload request details.
You must specify both the user_token and the file_upload_token in the URL path to identify which user and file upload request to get details for.
Each file upload request includes the file_upload_token, the types of files accepted (files_types_accepted), the time when the request was created, and whether the request is required to proceed with payouts.
The response also includes any referenced attributes (ref_attributes) that link the file request to specific data, such as bank account details or other identifiers.
The response will be a json object with the details of file upload request, which can then be used to determine what documents need to be uploaded by the user.