Total amount is not right

Hello, I have 2 issues with my premium plugin:

1-
The orders that have discounts don’t work as expected. I mapped the total amount field, as order total. But the plugin is ignoring it and sending the Items Subtotal, instead of the Order Total.

2-
The balance to pay sometimes is $0, how do I change this?

I only want the invoice to have the Order Total amount (the balance should also be the Total Order amount)

Thank you very much