Anybody looking for a temporary fix: The credit card verification regex is located here: /event-espresso-core-reg/core/libraries/form_sections/strategies/validation/EE_Credit_Card_Validation_Strategy.strategy.php
I added “|2[2-7][0-9]{14}” to the regex which should validate the 2-series MasterCards.
This is just a temporary fix! This needs to be adjusted in a future release.
Thanks for reporting this. The next release update (4.9.81.p) will include a fix.
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