This incident has been resolved by the upstream provider, Square.
Aug 3, 18:15 PDT
transactions processed in Checkfront with Square from 11:45 AM PST to 3:48 PM PST may not be reflected or have duplicate payments on the Checkfront invoice. It is best to reference your Square Dashboard to reconcile your Checkfront bookings accurately.
Aug 3, 16:10 PDT
A fix has been implemented and we are monitoring the situation closely.
Aug 3, 15:50 PDT
The issue has been identified and a fix is being implemented.
Aug 3, 15:36 PDT
We are currently investigating an issue with Square not accepting payments. The issue appears to be on Square's end, and we are closely monitoring the situation.
Aug 3, 14:50 PDT