Upload invoice attachment
documentedUpload an attachment to an invoice.
POST /Invoices/{InvoiceID}/AttachmentsInvoicesno implementation yet0 runsInput
InvoiceID*
Invoice ID
00000000-0000-0000-0000-000000000000
FileName*
Attachment FileName
invoice.pdf
AttachmentPath*
Attachment File Path
/path/to/invoice.pdf
Calls Xero as you (your API key is your account); keychains.dev holds the credentials.