question

I have a client who says their cloud pay display app gets stuck on the "Thank You" screen after processing a payment. The customer sees the amount on the screen, adds/doesn't add a tip, signs, and then sees the thank you screen and never goes back to the welcome screen. I do receive the payment on our website as "processed". This is the only customer who is having this issue all the other customers are working perfectly as expected. This customer was recently added. Any ideas what could be causing this issue?