The curious case of Google Pay's disappearing American Express cards has been fixed - Android

• Latest update
  Issue resolved

On Thursday, many American Express customers that had their cards loaded into Google Pay received a notice that their cards had been removed from the app. The cause was apparently a certificate issue, and over the next day or so, some customers had intermittent problems attempting to re-add their cards to Google Pay. We're told the issue has since been resolved, and though your disabled cards probably won't automatically reappear, you should be able to add them back now without any issue.

The curious case of Google Pay's disappearing American Express cards has been fixed was written by the awesome team at Android Police.