We just began using the online payment portal a few weeks ago and I just encountered this issue, and I must say it is a very unprofessional glitch that effects business' cash flow and misleads our clients. I can't believe this was first reported back in 2019 and has still not been resolved. Our customer made a partial payment on their invoice, which the embedded online payment link initially offers them the option of making a partial payment. Then when they return to make the another payment it says 'PAID Balance Due $0.00' with the Invoice number, and amount listed (which is the full initial invoice amount, not the amount they paid). Apparently it is an automatically generated page telling them nothing else is due, even though a balance is due. If the customer was not honest, they easily could claim they paid the full invoice according to the information on the page generated by Intuit.