I too am having the issue with the sale app popping up on chipped card insertion. My problem is the opposite however. I don't want customer mode to be exited and completing a payment allows the user full escape from customer mode and access to other apps and settings. This completely nullifies the point of customer mode and compromises the security of the device when in a customer's hands.
Is there some way to prevent this customer mode escape in a way that will not lock the user up in the sale app? Inserting a card when not prompted is an extremely common occurrence.
However, we are familiar that RPower is implementing a Native Integration. So, in your specific case, we will have our Native Integration team reach out to you and work with you directly on this issue.