Check was open on a terminal when the API tried to close it. Cant have the check open when applying payment. Handheld would have had an error like "Applying payment failed, Retry?" Sending the check on the workstation and using "Retry" will close it correctly. Staff training.
After a huge amount of error log checking, found a clue from POS API parameters of SOAP request AddToExistingCheckEx, and turned to be correct. Menu SLU issue. Super easy to fix, once found the cause.
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