I'm using Cashfree for accepting payments, I'm getting the above error while testing the payments even after my account is activated. after check out my page is redirecting back to the same page with the error.
I would recommend contacting Cashfree support as they can help troubleshoot this further by ensuring your account is set up correctly and the proper credentials are inputted into the Shopify admin.
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