Authorize.net fixed their issues. Those customers using them can not charge cards again.
Posted 7 months ago. Jul 17, 2018 - 20:02 PDT
Authorize.net is aware of an issue that is currently affecting transaction processing for merchants. They are working to resolve the issue as quickly as possible and apologize for any disruption. This ONLY pertains to Authorize.net users, No customers on Vagaro Merchant Services are affected. They have the current status located here - https://status.authorize.net/