Before you ask, I searched the forums, and read over 20 pages about Worldpay support.
Here's what I've done: downloaded the latest Worldpay 4.0 version 1.7 module, copied all the files correctly, added wpcallback.php to filenames.php, installed the module, got a Worldpay Select Junior account, put the installation ID in the osC admin, set the callback in WorldPay admin to what it said in the readme for non-secure osC setups, set it to test success, tried to buy something.
Here's what happens: it goes to Worldpay fine, I pay, get success (test) and it goes to the callback which just says "Thank you for shopping with <store name>", and nothing else. No continue button or auto redirect, so no purchase is recorded. Basically I think it's having the common problem of forgetting the osC session when it gets back from Worldpay.
Here's what I've tried: it seems other people had problems with the language bit, so I changed the '&' to a '?' before it... didn't work. I tried changing other things as well, nothing worked.
The contribution should work without changing any code. I tried to use this module on a different site when it was v1.4, also without any luck. I need this working before Wednesday, any ideas or hints.
Thanks for any help :)