title: After a successful payment, What hook is triggered in Woocommerce
body: <p>In Woocommerce, to send sms payment information to the customer, I need to activate a trigger after a successful payment.</p>
  
  <p>But I didn't find any hook do it</p>
  
  <p>This is my plugin code:</p>
  
  <pre><code>if ( isset( $this-&gt;options['wc_notify_customer_payment_successful_enable'] ) ) {
      add_action( '####Action to be used here#######', array( &amp;$this, 'successful_payment_notification_client' ) );
  }
  
  /* WooCommerce Successful payment notification client 
   *
   * @param $order_id
   */
  public function successful_payment_notification_client ( $order_id ) {
      // Check the mobile field is empty
      if ( empty( $_REQUEST['mobile'] ) ) {
          return;
      }
      $order          = new WC_Order( $order_id );
      $this-&gt;sms-&gt;to  = array( $_REQUEST['mobile'] );
      $template_vars  = array(
          '%order_id%'           =&gt; $order_id,
          '%order_number%'       =&gt; $order-&gt;get_order_number(),
          '%status%'             =&gt; $order-&gt;get_status(),
          '%billing_first_name%' =&gt; $_REQUEST['billing_first_name'],
          '%billing_last_name%'  =&gt; $_REQUEST['billing_last_name'],
          '%transaction_id%'     =&gt; get_post_meta( $order_id,'_payment_method_title', true ),
      );
      $message        = str_replace( array_keys( $template_vars ), array_values( $template_vars ), $this-&gt;options['wc_notify_customer_payment_successful_message'] );
      $this-&gt;sms-&gt;msg = $message;
      $this-&gt;sms-&gt;SendSMS();
  }
  </code></pre>
  
  <p>The desired hook should come in line two of my code.</p>
  
  <p>Any help will be appreciated.</p>