protected function process_order_payment( $order_id, $payment_method ) {
		$available_gateways = WC()->payment_gateways->get_available_payment_gateways();

		if ( ! isset( $available_gateways[ $payment_method ] ) ) {
			return;
		}

		// Store Order ID in session so it can be re-used after payment failure.
		WC()->session->set( 'order_awaiting_payment', $order_id );

		// Process Payment.
		$result = $available_gateways[ $payment_method ]->process_payment( $order_id );

		// Redirect to success/confirmation/payment page.
		if ( isset( $result['result'] ) && 'success' === $result['result'] ) {
			$result = apply_filters( 'woocommerce_payment_successful_result', $result, $order_id );

			if ( ! is_ajax() ) {
				wp_redirect( $result['redirect'] );
				exit;
			}

			wp_send_json( $result );
		}
	}