A theme park gift under $10? Theme Park Insider: 2016 Year in Review
This required vacation time and receipts of all three charges. (So Save those receipts).
This happened again at Island of Adventures at another gift store...key swipe ....nothing...but this time the vendor cancelled the transaction.
My advice would be just to use your credit card or pay cash until they work out the bugs in the key charge system.
And always check your charges the night before you leave.
Walt Disney World
Tokyo Disney Resort