Add gateway factory

config/services/gateway_factory.xml

@@ -0,0 +1,13 @@
+<container xmlns="http://symfony.com/schema/dic/services" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
+    <services>
+
+        <defaults public="true" autoconfigure="false" autowire="false"/>
+
+        <service id="bitbag.imoje_plugin.gateway_factory" class="Payum\Core\Bridge\Symfony\Builder\GatewayFactoryBuilder">
+            <argument>BitBag\SyliusImojePlugin\ImojeGatewayFactory</argument>
+            <tag name="payum.gateway_factory_builder" factory="imoje"/>
+        </service>
+
+    </services>
+</container>

src/ImojeGatewayFactory.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BitBag\SyliusImojePlugin;
+
+use BitBag\SyliusImojePlugin\Bridge\ImojeBridgeInterface;
+use Payum\Core\Bridge\Spl\ArrayObject;
+use Payum\Core\GatewayFactory;
+
+final class ImojeGatewayFactory extends GatewayFactory
+{
+    protected function populateConfig(ArrayObject $config): void
+    {
+        $config->defaults(
+            [
+                'payum.factory_name' => 'imoje',
+                'payum.factory_title' => 'Imoje'
+            ]
+        );
+
+        if (false === (bool) $config['payum.api']) {
+            $config['payum.default_options'] = [
+                'environment' => ImojeBridgeInterface::SANDBOX_ENVIRONMENT,
+                'merchant_id' => '',
+                'service_id' => '',
+                'service_key' => '',
+                'authorization_token' => '',
+            ];
+            $config->defaults($config['payum.default_options']);
+
+            $config['payum.required_options'] = ['environment', 'merchant_id', 'service_id', 'service_key', 'authorization_token'];
+
+            $config['payum.api'] = static function (ArrayObject $config): array {
+                $config->validateNotEmpty($config['payum.required_options']);
+
+                return [
+                    'environment' => $config['environment'],
+                    'merchant_id' => $config['merchant_id'],
+                    'service_id' => $config['service_id'],
+                    'service_key' => $config['service_key'],
+                    'authorization_token' => $config['authorization_token'],
+                ];
+            };
+        }
+    }
+}