I was wondering if your Payment Form support custom transaction IDs.
Lets say in instead of seeing the payments as #1, #2, #3, etc. I could list them to start with a custom value and increase from there? As in PF00001, PF00002, etc.
Unfortunately, it is not possible. In Payment Form, Transaction ID is generated/returned by the payment gateway which you are using, it could not be a custom value as you want.