I've got an offer to help a client integrate a WAP push into their WorldPay module. Unfortunately they want it done REAL SOON and I am new to OsCommerce so unless I get some pointers I doubt it'll be worth my while attempting it. We want to force customers who buy a particular product to supply a mobile number, then customise the WorldPay callback to POST the mobile to a WAP push server. I need to know if we can customise the buying procedure for particular products in this way, associate the mobile number with the OsCommerce session somehow so that the callback can retrieve the mobile number and POST it. (Doing the actual POST is OK, my problem is how to get a mobile number from the customer and get it into the WorldPay callback.)

I really appreciate any help. If it's not going to be relatively straghtforward I'll have to tell the client I can't do it in the time provided. I am experienced in Web/database coding, but I'm completely new to OsCommerce. Thanks in advance!