I’m getting the same issue. Customers are trying to pay by card, and for them, it appears to fail yet their payment has still been taken. Here’s is an example in my log files :
2020-05-21T08:29:45+00:00 NOTICE
====SumUp Version: 1.0.0====
Client ID: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
====Start Log====
Trying to process a payment but the transaction was invalid
====End Log====
2020-05-21T08:29:45+00:00 DEBUG
====SumUp Version: 1.0.0====
Client ID: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
====Start Log====
Trying to process a payment. Order ID: 347. Array
(
[result] =>
[message] => transaction_code_mismatch
)
====End Log====