I received an invoice for $3105, but only needed to pay $1500 because the work hadn't been completed yet. After entering my account and routing number I went to pay but the only option I saw was a big green button that said PAY $3105...but no option to modify that amount. Well, after 20 minutes of searching and 2 phone calls I finally figured out how to modify the payment amount. It's a link at the very very top of the payment screen next to the amount of the invoice...in super small, very light grey print...it's like you make it deliberately hard to find. That option should be down at the bottom of the screen, next to the big green button that says "PAY $3105" which, by the way, you make really easy to find. It feels like you deliberatly make it hard for the customer to choose how much of the total he wants to pay. This needs to be fixed.