i cant add my product to the cart in woocommerce code example

Example 1: 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 );

    }

}

Example 2: woocommerce apply coupon with add to cart

function wc_ninja_apply_coupon( $coupon_code ) {
	if ( 'test_code' === $coupon_code ) {
		$product_id = 99;
		WC()->cart->add_to_cart( $product_id );
	}
}
add_action( 'woocommerce_applied_coupon', 'wc_ninja_apply_coupon' );

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Misc Example