Hi there @Kirkino!
Don here from Shopify.
Could you let us know which payment method or gateway was being used which produced this message?
If you could also leave a link to your store here, and some info on the products you were trying to check out with, we can try to reproduce this from here insofar as possible.
The more information you can give us here the better we will be able to understand and help out.
Hi there @Zoson!
Don from Shopify once again.
If you're using 2Checkout as your gateway provider, and encountering this message while doing so, you would be best off to contact 2Checkout support directly as they'll be the ones best positioned to provide support for their gateway.
If you'd like us to take a look at your store anyway, please share a link with us here and let us know what products you were attempting to check out with, where you wanted to ship them to and we can try to reproduce this instance (though we will not be able to complete checkout, so may not be able to test this fully from here in Shopify).
I look forward to hearing from you!