Shopper using iPhone, went to shop URL from Facebook, tried to check out on FaceBook Browser, got message to choose a card to pay the remaining balance, but did not get a pop up window to edit or add a card. Tried using three dots to open the URL in Safari or Chrome, but did not work. Only after copying and pasting the shop URL to the browser like Safari or Chrome did the shopper get a prompt to add or edit the card.
This also prevents the PayPal and Sezzle pop ups from showing when the customer tries to check out with those payment methods.
Some shops are seeing this with the FaceBook browser, others are seeing it with the Safari browser on mobile.