if the dealers have different websites, get them to embed a hidden field in the shopping cart or paypal button that is their unique id.

ie <input type="hidden" name="dealerid" value="342432">

then pass it through to paypal, have ipn send it to your ipn script.

In your database put another field in your transaction record table something like dealerid and have another table with all your dealers details and their unique id number. Have the IPN script add the dealerid to every transaction.

then if you want to do a report on a specific dealer to see what they have sold to an SQL report something like:
select * from transactionRecordTable where dealerID = "$dealerID"

hope that gives you some ideas anyway

- paul -

- paul -