All Order Status "Completed" after Payment in woocommerce.

order_status_completed.php

<?php

/**
 * Author: Rocky Mehta
 * Link: https://rocky-mehta.com/
 * Email: rocky.mehta88@gmail.com
 * All Order Status = "Completed"  ( WooCommerce 2.2+ )
 */
add_action('woocommerce_thankyou', 'obw_all_orders_completed_function');
function obw_all_orders_completed_function() {
	global $woocommerce;

	if (!$order_id)
		return;
	$order = new WC_Order($order_id);
	$order->update_status('completed');
}

paid_order_status_completed.php

<?php


/**
 * Author: Rocky Mehta
 * Link: https://rocky-mehta.com/
 * Email: rocky.mehta88@gmail.com
 * All Paid Order Status = "Completed" after Payment ( WooCommerce 2.2+ )
 */
add_filter( 'woocommerce_payment_complete_order_status', 'obw_paid_orders_function' );
function obw_paid_orders_function( $order_status, $order_id ) {
	
	$order = wc_get_order( $order_id );
	if ( $order_status == 'processing' && ( $order->status == 'on-hold' || $order->status == 'pending' || $order->status == 'failed' ) ) {
		return 'completed';
	}
	
	return $order_status;
}