How do I change money due in 30 days to payment due upon completion

Happy to have you here on the Community page, @Dcadra.

We can change the payment due term for your invoices by clicking on the drop-down under Terms.

Here's how:

1. Go to the New (+) icon, then select Invoice under Customer.
2. Fill in the necessary information on the Invoice page, then click on the drop-down arrow under Terms.
3. Choose Due on receipt from the result.
4. Click on Save and close or the Save button to record the transaction.

Let me know if you have any other questions. I'm always happy to lend a helping hand. Wishing you a good one!