adding a new payment gateway

And this is my code

class MS_Gateway_Mtc
{

    const ID = 'mtc';

    /**
     * Gateway singleton instance.
     *
     * @since  1.0.0
     * @var string $instance
     */
    public static $instance;

    /**
     * Payment information for customer.
     *
     * The payment procedures like bank account, agency, etc.
     *
     * @since  1.0.0
     * @var string $payment_info
     */
    protected $payment_info;

    /**
     * Hook to show payment info.
     * This is called by the MS_Factory
     *
     * @since  1.0.0
     */
    public function after_load()
    {
        parent::after_load();

        $this->id = self::ID;
        $this->name = __('Maroc Telecommerce - Paiement sécurisé par Carte', 'membership2');
        $this->description = __('(Bank orders, cash, etc)', 'membership2');
        $this->group = __('Maroc Telecommerce Payment', 'membership2');
        $this->manual_payment = true; // Recurring billed/paid manually
        $this->pro_rate = true;
        /**
         * No sandbox option for mtc payment gateway
         * The mode is always set to live
         */
        $this->mode = 'live';

        if ($this->active) {
            $this->add_action(
                'ms_controller_gateway_purchase_info_content',
                'purchase_info_content'
            );
        }
    }

    /**
     * Show mtc purchase/payment information.
     *
     * Returns a default messsage if gateway is not configured.
     *
     * @hook ms_controller_gateway_purchase_info_content
     *
     * @since  1.0.0
     * @return string The payment info.
     */
    public function purchase_info_content()
    {
        static $Processed = false;

        /**
         * If some plugin calls <code>the_content()</code> multiple times then this
         * function will also run multiple times.
         * We want to process the details only once, so we have this condition!
         */
        if (!$Processed) {
            $Processed = true;

            do_action(
                'ms_gateway_manual_purchase_info_content_before',
                $this
            );

            if (empty($this->payment_info)) {
                $link = MS_Controller_Plugin::get_admin_url('settings');
                ob_start();
                ?>
                <?php _e('This is only an example of mtc payment gateway instructions', 'membership2'); ?>
                <br/>
                <?php
                printf(
                    __('Edit it %shere%s', 'membership2'),
                    '<a href="' . $link . '">',
                    '</a>'
                );
                ?>
                <br/><br/>
                <?php _e('Name: Example name.', 'membership2'); ?>
                <br/>
                <?php _e('Bank: Example bank.', 'membership2'); ?>
                <br/>
                <?php _e('Bank account: Example bank account 1234.', 'membership2'); ?>
                <br/>
                <?php
                $this->payment_info = ob_get_clean();
            }

            $this->payment_info = wpautop($this->payment_info);

            if (!empty($_POST['ms_relationship_id'])) {
                $subscription = MS_Factory::load(
                    'MS_Model_Relationship',
                    $_POST['ms_relationship_id']
                );
                $invoice = $subscription->get_current_invoice();
                $this->payment_info .= sprintf(
                    '<div class="ms-mtc-price">%s: <span class="ms-price">%s%s</span></div>',
                    __('Total value', 'membership2'),
                    $invoice->currency,
                    $invoice->total
                );

                // The user did make his intention to pay the invoice. Set status
                // to billed.
                $invoice->status = MS_Model_Invoice::STATUS_BILLED;
                $invoice->save();
            }
        }

        return apply_filters(
            'ms_gateway_manual_purchase_info_content',
            $this->payment_info
        );
    }

    /**
     * Verify required fields.
     *
     * @since  1.0.0
     * @return boolean True if configured.
     */
    public function is_configured()
    {
        $is_configured = true;
        $required = array('payment_info');

        foreach ($required as $field) {
            if (empty($this->$field)) {
                $is_configured = false;
                break;
            }
        }

        return apply_filters(
            'ms_gateway_manual_is_configured',
            $is_configured
        );
    }

    /**
     * Validate specific property before set.
     *
     * @since  1.0.0
     *
     * @access public
     * @param string $property The name of a property to associate.
     * @param mixed $value The value of a property.
     */
    public function __set($property, $value)
    {
        if (property_exists($this, $property)) {
            switch ($property) {
                case 'payment_info':
                    $this->$property = wp_kses_post($value);
                    break;

                default:
                    parent::__set($property, $value);
                    break;
            }
        }

        do_action(
            'ms_gateway_manual__set_after',
            $property,
            $value,
            $this
        );
    }

}

function mtc_register($api)
{
    $api->register_payment_gateway(MS_Gateway_Mtc::ID, 'MS_Gateway_Mtc');
}
add_action('ms_init', 'mtc_register');

thank you for your reactivity,
I am waiting your reponse.

For more explanation :

I try to add a new gateway and I use API membership 2 to create a plugin like documentation.
(MS_Gateway_Mtc)

THanks (^_^)

Hi kasia

Is there a solution to this problem ?

thanks