/loans

Request a new loan. You can request a loan for only one invoice. At the moment, we don't support multiple-invoices financing.
- You can either request a loan for an existing invoice, in which case you should set invoice_ids.
- Or you can create the invoice and request a loan with a single call to this API.
- If you pass an invoice in invoices, the base64-encoded value of the PDF of the invoice is required under the document property. You can for example use base64guru.