Hey @sippytheut. Sorry to hear your client's card is getting declined. This is usually related to an issue with the card itself. You can take a look at the settings in your Square Online Store under Checkout to make sure everything is set up correctly.
If you continue to experience the same thing please contact our Customer Success Team to look at your account in detail.
Thank you!
Sayra
Community Moderator, Square // Moderadora de la Comunidad, Square
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