Update for Woocommerce 3+
The wc_add_to_cart_message hook has wc_add_to_cart_message deprecated and replaced with wc_add_to_cart_message_html . You can use the following (compact efficient way):
add_filter( 'wc_add_to_cart_message_html', '__return_false' );
Or in the normal way:
add_filter( 'wc_add_to_cart_message_html', 'empty_wc_add_to_cart_message'); function empty_wc_add_to_cart_message( $message, $products ) { return ''; };
Before Woocommerce 3, use this:
Delete only the message (insert it into the function.php file inside the active child topic or theme). This function will return an empty message:
add_filter( 'wc_add_to_cart_message', 'empty_wc_add_to_cart_message', 10, 2 ); function empty_wc_add_to_cart_message( $message, $product_id ) { return ''; };
The code is placed in the function.php file of your active child theme (or active theme).
Note: wc_add_to_cart_message replaces the deprecated woocommerce_add_to_cart_message hook.
(UPDATED)
CSS: removing the top message box on the style.css design style.css (add this css rule to the style.css file located inside your active child theme or theme):
.woocommerce-checkout .woocommerce .woocommerce-message { display:none !important; }