How to set payment method in woocommerce via php?

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function add_payment_gateway() {
    add_filter( 'woocommerce_payment_gateways', 'add_custom_payment_gateway' );
    
    function add_custom_payment_gateway( $gateways ) {
        $gateways[] = 'WC_Custom_Payment_Gateway';
        return $gateways;
    }
}

add_action( 'plugins_loaded', 'add_payment_gateway' );

class WC_Custom_Payment_Gateway extends WC_Payment_Gateway {
    public function __construct() {
        $this->id = 'custom_payment_gateway';
        $this->method_title = 'Custom Payment Gateway';
        $this->title = 'Custom Payment Gateway';
        $this->has_fields = true;
        $this->init_form_fields();
        $this->init_settings();
        
        add_action( 'woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'process_admin_options' ) );
    }

    public function init_form_fields() {
        $this->form_fields = array(
            'enabled' => array(
                'title' => 'Enable/Disable',
                'type' => 'checkbox',
                'label' => 'Enable Custom Payment Gateway',
                'default' => 'yes'
            )
        );
    }

    public function process_payment( $order_id ) {
        $order = wc_get_order( $order_id );
        $order->update_status( 'processing' );
        $order->reduce_order_stock();
        WC()->cart->empty_cart();

        return array(
            'result' => 'success',
            'redirect' => $this->get_return_url( $order )
        );
    }
}