function woo_custom_cart_button_text() {

if (is_single(‘Product1’)) {

return __( ‘Subscribe Now’, ‘woocommerce’ );

} else {

return __( ‘Book’, ‘woocommerce’ );

}
}

add_filter( ‘woocommerce_product_single_add_to_cart_text’, ‘woo_custom_cart_button_text’ );