(Solved) Change SodaqOneTracker payload

I want to change the transmit LoRa message to a shorter message.
Looking at the SodaqOne.ino program at line 837, where can I find documentation that is meant here. A bit further “to populate all fields” (line 877) …
I do not see the complete payload. Can somebody guide me where to look how the software is building up it’s payload of 21 bytes?

Found it! It is at Sketch Tab ‘ReportDataRecord.cpp’