The error is what the bank is sending back to the payment gateway, so there is limited information on what could be causing the issue. However; if you're using Shopify Payments and this error is appearing, then I'd recommend reaching out to Shopify Support. The advisor you connect with can review the order and speak with our Payments team to see if there is any further insight we can provide on why the charge was declined. You can contact Shopify Support by logging into your account through our Help Centre, searching your question/issue, then selecting "contact support" at the bottom of the page that displays the search results.
Trevor | Community Moderator @ Shopify - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog