"I’d be delighted to help with processing your payment/payment arrangement. Before we start, I want to let you know there is a $10 payment support fee. I don't want to add any more money than you have to pay today. If you'd like, I can walk you through the app to make a payment/payment arrangement. And best of all, it's free! 
 
Shall I walk you through making a payment via our self-service? 

Let me walk you through on how to do it on the app, shall we? "(PAY YOUR BILL/SET UP PA)