WooCommerce - filter orders by Payment Method if High Performance Order Storage option is active

woo-hpos-filter-orders-by-payment-method.php

<?php

/* add as MU plugin 

Notes: 

1. it ONLY works with Hight Performance Order Storage option enabled; 

2. in line 37 there's plain $_GET used without any sanitization; that's insecure
so consider extending it to make sure no malicious data is inejected/use at your own risk

Tested with WooCommerce 8.7.0 (backwards/forward compatibility unknown


*/

function add_filter_by_payment_method_orders() {
    global $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( 'woocommerce_order_list_table_restrict_manage_orders', 'add_filter_by_payment_method_orders', 99 );

/**
 * Process bulk filter order for payment method
 *
 */
function add_filter_by_payment_method_orders_query( $vars ) {
	
    if ( isset( $_GET['_shop_order_payment_method'] ) ) {
	
		$vars['payment_method'] = $_GET['_shop_order_payment_method'];
      
    }
    return $vars;
}
add_filter( 'woocommerce_order_query_args', 'add_filter_by_payment_method_orders_query', 99, 1 );