lost add to cart woocommerce button code example

Example 1: how to change add to cart text button woocommerce

// To change add to cart text on single product page
add_filter( 'woocommerce_product_single_add_to_cart_text', 'woocommerce_custom_single_add_to_cart_text' ); 
function woocommerce_custom_single_add_to_cart_text() {
    return __( 'Buy Now', 'woocommerce' ); 
}
// To change add to cart text on product archives(Collection) page
add_filter( 'woocommerce_product_add_to_cart_text', 'woocommerce_custom_product_add_to_cart_text' );  
function woocommerce_custom_product_add_to_cart_text() {
    return __( 'Buy Now', 'woocommerce' );
}

Example 2: add_to_cart how to call it woocommerce

add_action( 'template_redirect', 'quadlayers_add_to_cart_function' );

function quadlayers_add_to_cart_function () {

    $product_id = 1326;

    if ( WC()->cart->get_cart_contents_count() == 0 ) {

        WC()->cart->add_to_cart( $product_id );

    }

}