Client(s) paid but invoice says “Past Due”

So I’ve had two clients book with me and I’ve completed the service and all is well until I send them their invoice for the booking. They use one of my accepted payment methods I have listed through this software, one client sent payment via Zelle and the other client sent payment via Venmo and both clients still ended up saying “past due” they stayed in “Past Due” until I was able to put a credit on their invoice for the amount they were due. This doesn’t help me keep track of how much money I’ve made thus far on the app. It just places their invoice’s as “Paid” I want to be able to mark their invoice as paid, or paid in full via Venmo maybe even (paid x via Venmo) so I know how much I made specifically off that booking(since a lot of the times they will tip me as well) right now I’ve made $174 through scritches but it’s only saying I’ve made $2 and some change. (I accidentally gave the first client a credit including the taxes it charged her so that’s why I’m positive anything at all. It’s not showing I made $36 off her Zelle or the $98 I made off the sitting, I got a $40 tip from the people. It’d be nice if I could change the invoice to “Paid” manually if need be and it would be nice if I could add in a tip somewhere to be able to track every penny I’ve profited off using this app.