💳 Modulo de pago — estructura y desarrollo

<?php

if (!defined('_PS_VERSION_')) { exit; }

class MyGateway extends PaymentModule
{
    public function __construct()
    {
        $this->name            = 'mygateway';
        $this->tab             = 'payments_gateways';
        $this->version         = '1.0.0';
        $this->author          = 'gmartos.es';
        $this->need_instance   = 1;
        $this->bootstrap       = true;
        $this->currencies      = true;   // Soporte de monedas
        $this->currencies_mode = 'checkbox'; // o 'radio'

        parent::__construct();

        $this->displayName = $this->trans('Mi Pasarela de Pago', [], 'Modules.Mygateway.Admin');
        $this->description = $this->trans('Descripcion de la pasarela.', [], 'Modules.Mygateway.Admin');
        $this->confirmUninstall = $this->trans('¿Seguro que deseas desinstalar?', [], 'Modules.Mygateway.Admin');
    }

    public function install(): bool
    {
        return parent::install()
            && $this->registerHook('paymentOptions')
            && $this->registerHook('paymentReturn');
    }
}

<?php

use PrestaShop\PrestaShop\Core\Payment\PaymentOption;

/**
 * PS 1.7+: usar hookPaymentOptions (devuelve array de PaymentOption)
 */
public function hookPaymentOptions(array $params): array
{
    if (!$this->active) {
        return [];
    }

    // Verificar que la moneda activa es compatible
    if (!$this->checkCurrency($params['cart'])) {
        return [];
    }

    $option = new PaymentOption();
    $option->setModuleName($this->name)
           ->setCallToActionText($this->trans('Pagar con Mi Pasarela', [], 'Modules.Mygateway.Shop'))
           ->setAction($this->context->link->getModuleLink($this->name, 'payment', [], true))
           ->setAdditionalInformation(
               $this->context->smarty->fetch('module:mygateway/views/templates/front/payment_info.tpl')
           );

    return [$option];
}

private function checkCurrency(Cart $cart): bool
{
    $currency = new Currency($cart->id_currency);
    $currencies = $this->getCurrency($cart->id_currency);
    return $currencies && in_array($currency->iso_code, ['EUR', 'USD']);
}

<?php

if (!defined('_PS_VERSION_')) { exit; }

class MyGatewayPaymentModuleFrontController extends ModuleFrontController
{
    public function initContent(): void
    {
        parent::initContent();

        $cart = $this->context->cart;

        // Verificaciones de seguridad
        if (!$cart->id || !$cart->id_customer) {
            Tools::redirect('index.php?controller=order');
        }

        $total     = $cart->getOrderTotal(true);
        $currency  = new Currency($cart->id_currency);
        $customer  = new Customer($cart->id_customer);

        // Crear sesion de pago con la pasarela externa
        $paymentSession = $this->createPaymentSession($total, $currency->iso_code);

        if (!$paymentSession) {
            $this->errors[] = $this->trans('Error al conectar con la pasarela.', [], 'Modules.Mygateway.Shop');
            $this->redirectWithNotifications('index.php?controller=order');
            return;
        }

        // Guardar datos en session para la validacion posterior
        $this->context->cookie->__set('mygateway_session_id', $paymentSession['id']);
        $this->context->cookie->__set('mygateway_cart_id', (string) $cart->id);
        $this->context->cookie->write();

        // Redirigir a la URL de pago de la pasarela
        Tools::redirect($paymentSession['payment_url']);
    }
}

<?php

if (!defined('_PS_VERSION_')) { exit; }

class MyGatewayConfirmationModuleFrontController extends ModuleFrontController
{
    public function initContent(): void
    {
        parent::initContent();

        // Verificar el pago con la pasarela
        $sessionId = $this->context->cookie->mygateway_session_id;
        $cartId    = (int) $this->context->cookie->mygateway_cart_id;

        $paymentResult = $this->module->verifyPayment($sessionId);

        if (!$paymentResult || $paymentResult['status'] !== 'paid') {
            $this->errors[] = 'Pago no confirmado.';
            Tools::redirect('index.php?controller=order&step=1');
            return;
        }

        $cart     = new Cart($cartId);
        $customer = new Customer($cart->id_customer);
        $currency = new Currency($cart->id_currency);
        $total    = (float) $cart->getOrderTotal(true);

        // CREAR EL PEDIDO — el metodo mas importante de PaymentModule
        $this->module->validateOrder(
            $cartId,                                    // id_cart
            Configuration::get('PS_OS_PAYMENT'),        // id_order_state (pagado)
            $total,                                     // amount_paid
            $this->module->displayName,                 // payment_method
            null,                                       // message (optional)
            ['transaction_id' => $paymentResult['id']], // extra_vars
            $currency->id,                             // currency_special
            false,                                     // dont_touch_amount
            $customer->secure_key                      // secure_key
        );

        Tools::redirect('index.php?controller=order-confirmation'
            . '&id_cart=' . $cartId
            . '&id_module=' . $this->module->id
            . '&id_order=' . $this->module->currentOrder
            . '&key=' . $customer->secure_key
        );
    }
}