How do I stop syncing payments, if I close sales orders with invoices?

Connex will add payments for paid orders by default

How do I add the rule?

Here are the steps:

1. Login to Connex.
2. On the left, click rules > my rules.
3. Click add rule.
4. Select map field, based on condition.
5. Click Advance.
6. As the action, click mark invoice as unpaid.
7. In the rules grid, enter these values: payment method, equals, *.
8. Click Submit.