When all the checks close, the check details are sent over to Punchh via isl.punchh.com. When a guests scans the barcode, this barcode has specific check items related to it and we give points accordingly.
When the https://isl.punchh.com/ping is showing an error, the check details are not sent over to Punchh. and we do not have information on how many points to give the guests. As a result, when the guest attempts to scan the barcode to earn points, they get a Failed POS lookup error despite having the correct barcode.
All should return a white screen with the word ok. In this instance, the https://isl.punchh.com/ping returned an error related to certification:
Make sure that the browsers are updated to the latest version. If they are on a domain then the domain policies probably have to be updated to accept the latest SSL protocols or certificate authorities. If you are on a domain then the domain policies probably have to be updated to accept the latest SSL protocols or certificate authorities.