We have had no known issues regarding the Shopify Payments gateway in the last 24 hours. This is definitely important to us so I would like to gather more context here.
Are you able to advise me of any specific error messages that appeared when customers tried to checkout with as per normal using Shopify Payments?
Are you still receiving this error with Shopify Payments?
Once I get a response I can look into this further for you. For future reference, you can always refer to this link here for any issues that do arise on the platform. We appreciate you bringing this to our attention!