How can i call editPost controller after an observer(checkout_onepage_controller_success_action) Magento 2

Question

I have to save the account edit with customer default shipping address details. After the successful order placement.

I have created the observer but not sure how to call editPost of the customer from that execute method.

<?php
 namespace YX\Customer\Observer;
 use Magento\Framework\Event\Observer;
 use Magento\Framework\Event\ObserverInterface;


class OrderSuccess implements ObserverInterface
{
  protected $customerSession;

    public function __construct(
        \Magento\Customer\Model\Session $customerSession
    )
    {
        $this->customerSession = $customerSession;
    }

/**
 * @param Observer $observer
 * @return void
 */
public function execute(Observer $observer)
{
    // TODO: Implement execute() method.
    $customer = $this->customerSession->getCustomer();
    $shippingAddress = $customer->getDefaultShippingAddress();
    if ($shippingAddress) {
        $firstname =  $shippingAddress->getFirstname();
        $secondname =  $shippingAddress->getLastname();
        $telephone =  $shippingAddress->getTelephone();
    }

 }
}

Now I need to send these 3 parameter $firstname, $secondname, $telephone to editPost controller.

How can to achieve it.

My code looks something like that

public function execute(Observer $observer)
{
    // TODO: Implement execute() method.
    $customer = $this->customerSession->getCustomer();
    $shippingAddress = $customer->getDefaultShippingAddress();

    if ($shippingAddress) {
        $firstname =  $shippingAddress->getFirstname();
        $secondname =  $shippingAddress->getLastname();
        $telephone =  $shippingAddress->getTelephone();
        $customer->setData('firstname', $firstname);
        $customer->setData('lastname', $secondname);
        $customer->setData('mobile', $telephone);
        $customer->save();
    }

Answer 1

In your

Vendor\ModuleName\etc\frontend\events.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="checkout_onepage_controller_success_action">
        <observer name="custom_frontend_observer" instance="Vendor\ModuleName\Observer\AfterCheckout" />
    </event>
</config>

In your

Vendor\ModuleName\Observer\AfterCheckout.php

 use Magento\Framework\Event\Observer;
 use Magento\Framework\Event\ObserverInterface;


class AfterCheckout implements ObserverInterface
{
  protected $customerSession;

    public function __construct(
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Customer\Model\CustomerFactory $customerSession
    )
    {
        $this->customerSession = $customerSession;
        $this->customer        = $customer;
    }

/**
 * @param Observer $observer
 * @return void
 */
public function execute(Observer $observer)
{
    // TODO: Implement execute() method.
    $customerId = $this->customerSession->getCustomer()->getId();
    $order = $observer->getOrder();
    $customer   = $this->customer->create()->load($customerId);
    $customer->setData('firstname',$order->getFirstName );
    $customer->setData('lastname', $order->getLastName);
    $customer->setData('mobile',$order->getMobile );
    $customer->save();

}