WooCommerce payment gateway

A provider response is not automatically a paid order. Model captured, authorization-only, asynchronous pending, failed, refunded, and duplicate callback states explicitly.

Register the gateway

add_filter( 'woocommerce_payment_gateways', static function ( array $gateways ): array {
    $gateways[] = MyPlugin\Payment\Gateway::class;
    return $gateways;
} );

Register a class name so WooCommerce controls instantiation.

Minimal gateway class

namespace MyPlugin\Payment;