I used a real credit card to check out as a real customer and my card was declined. The alert on my own card was:
Of course, test mode closed, but there're still a lot abandoned checks due to
I'm french, sorry for my bad english.
Hi there Brahim!
Don here from Shopify!
It sounds like your error is coming from a third-party credit card gateway. :)
As such, you'd need to check in with the support team of the gateway you are using.
Just check online for their support or contact pages based on what gateway you're using on the site and let them know about the error you encountered.
They'll be able to provide help and support for their gateway from there. :)
All the best!