Can I just create sales orders and invoices without payments?

Add a rule that marks sales as unpaid

If the order is unpaid, our tool should create no payment. If you want to mark certain orders as unpaid, follow these steps:

1. Go to the Connex rules engine.
2. Click action and add new rule.
3. In the title, enter mark as unpaid.
4. As the action, choose mark invoice as unpaid.
5. Enter a field to compare, such as payment method.
6. Enter a map from value, such as PayPal.
7. In the map to, just enter true.