The most “interesting” part is the step 2 of 3 – Payment Information because here is computed the order value including any discount, here the user can redeem his code and here the user will choose the payment option.
We assume that the user is in this page :checkout_payment
1) the address has been selected in the previous step.
2) how the total to pay si computed:
- all payment modules enabled are scaned and the “process” method for every single “module” class is executed.
For example:
The system load all php files which contain classes about payment :
In /includes/modules/order_total
are loaded the following files:
- ot_lev_discount.php
- ot_subtotal.php
- ot_coupon.php
- ot_tax.php
- ot_loworderfee.php
- ot_gv.php
- ot_total.php
In every single file above mentioned is defined the corresponding class. Every class has a standard structure ( methods).
The “process” method is called in checkout_payment:
- /includes/modules/pages/checkout_payment/header_php.php
- /includes/templates/YOURTEMPLATE/templates/tpl_checkout_payment_default.php
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