post https://gateway.stage.bill.com/connect/v3/spend/reimbursements/image-upload-url
Create a reimbursement image upload URL.
From the response, use the upload url
to upload a receipt image for the reimbursement.
curl '{upload_url}'
--upload-file {file_name_with_extension}
See Reimbursements in the Guides section for more information, sample requests, and responses.