We need to send customers a transaction ID number with successfully completed PayPal transactions via e-mail, which we collect at the point of sale. Each transaction would have a unique identifier on it. We are passing "messageID" under ITEM_NUMBER html variable with the DONATION button form but it's not being returned on the "successURL'". What Advanced Script should we be utilizing on the PayPal button to get that ITEM_NUMBER returned to the website when the transactions completed? This is not to be confused with the Item Number assigned within the PayPal button itself. That is the product identifier for us, not the transaction payor identifier.
... View more