First reported: Mar 13, 2023 for AbanteCart Version 1.3.3.
Description: Get “Unknown Error: AbanteCart core v.1.3.3 Class “net\authorize\api\contract\v1\MerchantAuthenticationType” not found in xxxxxxxx.”
Resolved: Mar 13, 2023. Code added to AbanteCart version 1.3.4.
Patch file: https://why2central.net/patch/abantecart-v1-3-3-default-authorizenet-patch-file/.
GitHub URL: https://github.com/abantecart/abantecart-src/issues/1558.