For most payment modules, you will have to work with a third-party API. In this section, we will build a payment method on a very simple API and we will also learn how to save the transaction ID. We will use the
api.php script attached to the code of this chapter. You can open it if you want to see how it works, but in summary, we need the following variables as POST values:
api_credentials_id: For this, in our case, we have to send the
id_cart: This is the cart ID
total_to_pay: This is the total amount of the order
validation_url: This is the URL that the
api.phpscript will call to confirm that the order has been paid
return_url: This is the URL that the customer will be redirected to if he or she ...