post https://api.soldo.com/business/v2/transactions//attachments/
After you got the temporary file URL of type UPLOAD_URL and the attachment file is uploaded, the upload of the TransactionAttachment must be confirmed.
After you got the temporary file URL of type UPLOAD_URL and the attachment file is uploaded, the upload of the TransactionAttachment must be confirmed.
Try It! to start a request and see the response here!