EcinteractivePLUS Eprocurement - Attachments in cXML Invoice

Short request:
Add functionality to allow dealers to attach a .pdf file copy of the invoice, within the cXML invoice details we send to the eprocurement customer.

Details:
The three dealers listed have a high-grossing punchout implementations with the same eprocurement customer. This customer has recently added a new requirement calling for a picture of the full invoice to be included as a file attachment in the cXML invoice details we send.

The customer's eprocurement team sent the following outlining specs:
https://compass.coupa.com/en-us/products/product-documentation/supplier-resources/for-suppliers/integration-resources/compliant-invoicing/add-an-encoded-attachment-to-a-cxml-invoice