PLEASE HELP - DISABE SHIPPING ZONE BASED ON PAYMENT

[L!mit]

Hi I baiscally just need to know how I can disable the shipping module from reading the shipping zone based on the payment module.

 

Here an example of what I tired.

 

$selection = $payment_modules->selection();

 

if (($selection ['module'] == 'CREDIT_CARD') && ((int)MODULE_SHIPPING_FLAT_ZONE > 0) ) {

$check_flag = false;

 

I just cant figue out how to call the payment module into the shipping file. Anyone know what the global would be or how I can do it?

 

Any help would be great I have been trying this for hours. Still new to PHP.