Punchh only picks the data from ISL on behalf of the barcodes which ISL has received from POS.
When the barcodes match for the transactions between the ISL and Punchh then it is save the data to Punchh which is reflected in "Receipt item data" export.
Note: Non-loyalty transactions are not displayed in "Receipt item data" export.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)