Authorize.net changes its Uri endpoints during 2020.
We checked the endpoints with our current QMerchant v.15 software. in our opinion QMerchant v.15 is not affected by this change.
Nevertheless there may be actions necessary on your side.
What actions do I need to take?
For API users please work with your developer/solution provider to review what API endpoint is used and if using our current Akamai endpoints review and ensure certificate is installed/trusted by host/solution. If certificate is needed please see support article: How do I obtain Authorize.Nets Certificate for my host/solution provider?
I use a firewall that needs IP Addresses to white list outbound and/or inbound connections. What do I need to do?
If your solution uses a firewall to filter outbound and/or inbound connections, make sure to white list IP Address provided in our support article: Authorize.Net Domains and IP Addresses