Session variables trouble - SOS

[javerleo]

I'm trying to write a new payment module to allow customers use 'virtual money' to make an order. This virtual cash comes from residuals (this is a multilevel marketing system) and is stored in a separated table. I have used the same model proposed by oscommerce developers to build new payment modules and even though I carefully checked the code still get wrong results in some calculations. I discovered problem arises when checkout process reaches the checkout_payment.php script. I notice the wrong results come from the session variables being empty temporary. Since I use customers_id session variable to make SQL queries and calculations the validations and procedures I need simply do not work.

I use Oscommerce 2.2 ms2, mysql 5.0.21 and php 5.1.4

 

Any suggestion will be helpful.

 

Thanks in advance.