How to add the number of steps in the application process in OpenCart?

Question

opencart

It is necessary to send it to CRM before sending it for payment
- If the user is in CRM, then half the trouble
- If the user is not in CRM, then issue a registration confirmation button
Now I do the interception in the place after the code:
if ($this->validate() && ($ asap || (!$asap && $this->data['simple_create_order']))) {
// Get order data via
$this->load->model('checkout/order');
$order_data = false;
$order_data = $this->model_checkout_order->getOrder($order_id);
}
So far, after intercepting data for debugging, exit. But I don’t know how to stop forwarding for payment and show information about the discount calculated through CRM, and then send the amount with the discount to the payment card. I will obviously spend more than 1 day on the analysis, since I am new to OpenCart, but I need to do it tomorrow ...
I will be very grateful for the help !!!