WooCommerce Payment Gateway Development — a practical guide to WooCommerce payment gateway development with clear examples you can reuse in real projects.
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Short description
Extend `WC_Payment_Gateway`, register via filter, implement settings + `process_payment`.
Register gateway
add_filter('woocommerce_payment_gateways', function ($gateways) {
$gateways[] = 'WC_Gateway_Acme';
return $gateways;
});