Common fields to identify a unique transaction

[nikshaw]

I was wondering if there is any combination of fields that one could use on a receipt that would help uniquely identify a transaction in a POS system across multiple POS types (retail, restaurants, etc.  Could you use register number/terminal id, time, date and amount?  Or is there an easier way to do it?

[Henny]

Usually all of those you mention along with  simple receipt number signify the individual transaction/sale.

[nikshaw]

do all sales receipts have the receipt number on it?  if so, is it possible just to use the receipt number as the unique identifier rather than the other fields?

[Henny]

Yes, the receipt number would be the unique identifier.

[nikshaw]

I collected a few receipts over the past few days and noticed that not all of them have a unique transaction number printed.  Is this just a setting that can be made on the POS system to have it print the unique transaction number?  Also, in the absence of a unique transaction number, what fields on the receipt would you suggest I use to identify the transaction and match it to the transaction in the POS database?

[Henny]

Most modern receipts print the transaction in a barcode font instead of a legible font.

[anirow]

Yes exactly they are all printed in barcode format.