Get a document that is attached to a BILL object. You can retrieve documents attached to different BILL objects - bill, vendor, customer, vendor credit, bill payment, invoice payment, or chart of accounts.
Note: Currently, /GetDocumentPages.json does not support retrieving documents attached to an invoice.
In your request, set id as the BILL object ID. For example, set id as the bill ID for retrieving a document that is attached to the bill.
BILL object without an attachment
In the response, fileUrl is set as null.
BILL object with an attachment
In the response, a fileUrl is generated and numPages returns the number of pages in the attachment.
Use the returned ID in a subsequent GET request for downloading the attachment. For a single-page attachment, set pageNumber as 1 in your GET request.
curl –request GET ‘https://api-sandbox.bill.com/is/BillImageServlet?entityId={fileUrl_id}&sessionId={sessionId}&pageNumber={page_number}’
Note that documents are downloaded in the PNG format.