Where do I report bugs with the STACK app/card? Mike March 05, 2019 20:36 Updated Follow We are always looking to fix any bugs we encounter with the STACK app & card. If you encounter a bug, please report it here! Related articles Who can apply for STACK? What is your partnership with Mastercard? How does the referral program work? Amazon Prime Offer Why is STACK not available in Quebec? Comments 0 comments Please sign in to leave a comment.