Your accounting package

The order says which invoice it became and whether it has been paid, without anybody typing it twice.

Tell your accounting package an order is ready to invoice, and read the invoice reference and the paid state back.

Status	Works today: Kabaido code talks to the provider.
Kind	Accounting
For	Sales Engineer, Service Centre, Commerce and Source
What moves	Out: an order ready to invoice, as an event with its number, customer and currency. In: the invoice reference, amount, dates and paid state.
What you hand over	The endpoint's own token, and optionally a signing secret. Your accounting package's credentials stay with your accounting package.

What you get

The order says which invoice it became and whether it has been paid, without anybody typing it twice.

In Settings then Integrations, open the entry and follow its steps:

Step 1.
Create an inbound endpoint below and copy its tokenised URL.
Step 2.
Point Zapier, Make, n8n or your own middleware at it, from your accounting package.
Step 3.
Post the invoice reference, amount and dates back against the order number.
Step 4.
The order shows the reference, the due date and the paid state.