If all payments are no longer working, then this may be related to the TLS updates various vendors out there have updated. We speak about this at a high level in the post below.
https://upendoventures.co...ut-the-TLS-12-Update As for how to troubleshoot/resolve this issue, you're using a custom payment method, so you'll need to run the site locally and debug it using Visual Studio.
If you'd like more formal assistance with this, you could consider hiring us to resolve the issue for you, or we can also give you a higher level of support via Developer Support Services. Links to both are below.
https://upendoventures.co...at/Hotcakes-Commerce https://upendoventures.co...ce-Developer-Support
Will Strohl, Upendo Ventures
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