Subscription Price Verification

[kbadr]

(I posted this at VB.com, but I was told it was a hack request and I should post it here. All I need is a "yes" or "no", though. I don't need code)

I wasn't sure where to post this. It's a question for a VB developer, I think.

I want to hack the subscriptions.php page to conditionally change the price of a subscription (to allow upgrades for someone who purchased a different subscription plan already.) I am proficient in PHP and I know how to do this.

My question is, if a subscription is listed in the VB database as costing $X, but Paypal processes it as $Y, will VB reject the subscription? Does it do any sort of check to make sure the amount Paypal received is the amount the subscription costs, as listed in the VB database? I looked at the VB code, and it doesn't seem to do a check like this, but I just wanted to post to make sure.

If the price is verified, that's not really a problem. I just can just create an additional Upgrade Subscription that is only visible to users who should get the special upgrade price.

Thanks, ahead of time.