The Invoice ID of the zero cost invoice in Flow.

What is the status of the invoice, Sent or Paid.

The invoice ID: In Billogram found at the end of the URL example: https://billogram.com/billogram/show/ufAVYEP3, In GoCardless found at the end of the URL example: https://manage.gocardless.com/payments/PM01736Q2RNZW3

The total amount for the invoice, the whole digits including the 2 decimals