I just updated to the new 190617. Since I use Authorize.net, this meant I needed to use the Signature Key. I decided to test this by creating an s2member subscription, with Authorize.net as the payment option.
At first, I kept getting errors about an AVS mismatch. This is correct; we have strict security settings on Authorize.net.
But when I finally got the correct address in there, the message was:
Error #252: Your order has been received. Thank you for your business!.
Image here: https://imgur.com/a/RW8VE0j
This seems really confusing. And especially dangerous for a brand-new client.
I wouldn’t be surprised if Auth.net is simply sending this along without any kind of “success” flag, and a solution might needed to be hard-coded with a list of “error” messages that should show as success. But, I don’t know.