WooCommerce Filtering Orders by Payment methods

functions.php

<?php

/**  Order by payment method
* Add payment method bulk filter for orders
*/
function add_filter_by_payment_method_orders() {
   global $typenow;
   if ( 'shop_order' === $typenow ) {
       // get all payment methods
       $gateways = WC()->payment_gateways->payment_gateways();
       ?>
       <select name="_shop_order_payment_method" id="dropdown_shop_order_payment_method">
           <option value=""><?php esc_html_e( 'All Payment Methods', 'text-domain' ); ?></option>
           <?php foreach ( $gateways as $id => $gateway ) : ?>
           <option value="<?php echo esc_attr( $id ); ?>" <?php echo esc_attr( isset( $_GET['_shop_order_payment_method'] ) ? selected( $id, $_GET['_shop_order_payment_method'], false ) : '' ); ?>>
               <?php echo esc_html( $gateway->get_method_title() ); ?>
           </option>
           <?php endforeach; ?>
       </select>
       <?php
   }
}
add_action( 'restrict_manage_posts', 'add_filter_by_payment_method_orders', 99 );

/**
* Process bulk filter order for payment method
*
*/
function add_filter_by_payment_method_orders_query( $vars ) {
   global $typenow;
   if ( 'shop_order' === $typenow && isset( $_GET['_shop_order_payment_method'] ) ) {
       $vars['meta_key']   = '_payment_method';
       $vars['meta_value'] = wc_clean( $_GET['_shop_order_payment_method'] );
   }
   return $vars;
}
add_filter( 'request', 'add_filter_by_payment_method_orders_query', 99 );