We can add product to WooCommerce cart using add_to_cart() function with $product_id.
<?php
add_action( 'wp', 'woocommerce_add_product_to_cart' );
function woocommerce_add_product_to_cart() {
$product_id = 123; // product ID to add to cart
WC()->cart->empty_cart();
WC()->cart->add_to_cart( $product_id );
}
?>Code goes in function.php file of your active child theme (or active theme).
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