A customer's order has the 'Waiting for Payment' status in PBA, the customer does not have any valid payment method on file and Provider wants to provide services to the customer on credit.
The Provider increased credit limit for the customer account (through the Credit Terms assigned to the account or set custom credit limit) and tried to process the order using the 'Process Order if Payments are received' button in the order properties.
Clicking the 'Process Order if Payments are received' button does not help to process the order, it is still sitting in the 'Waiting for Payment' status.
Create custom manual order flow transition from the 'Waiting for Payment' to 'I2' status which will check if credit card processing is required for an order, use the parameters of the custom transition like provided on the screenshot below:
After you created order flow transition go to the 'Waiting for Payment' order which you want to process for a customer without payment and click the 'Recheck credit limit' button. As the result PBA will re-check credit limit on the customer account and process the order if credit limit is enough. Finally, if order was processed PBA will create open invoice which customer must pay later.
After the order is processed consider to remove the custom order flow transition.