Creating the payment validation controller

The payment validation controller is set as the action target URL of our module payment option by using this code:

$cashOfflineOption->setAction($this->context->link->getModuleLink($this->name, 'validation', [], true))

We can now implement this validation controller responsible for creating a new order from the cart. As we already have seen how to create a module front controller, we can create the /modules/whcashpayment/controllers/front/validation.php file containing the WHCashPaymentValidationModuleFrontController class.

It can be implemented with the following code:

<?php
class WHCashPaymentValidationModuleFrontController extends ModuleFrontController
{
  public function postProcess()
  {
    if (!($this->module instanceof WHCashPayment)) {
      Tools::redirect('index.php?controller=order&step=1');
  ...