WooCommerce Payment Gateway Development

Reference for building payment gateways with classic and block checkout support.

1. Gateway Registration

add_filter( 'woocommerce_payment_gateways', function ( array $gateways ): array {
    $gateways[] = 'MCE_Gateway';
    return $gateways;
} );

Extend WC_Payment_Gateway and implement process_payment() and optionally process_refund().