WordPress at a glance
filter is not described

(hook_prefix)purchase_note filter-hook . WC 1.0

Inherit value from parent.

Usage

add_filter( '(hook_prefix)purchase_note', 'filter_function_name_2552', 10, 2 );
function filter_function_name_2552( $parent_data_purchase_note, $that ){
	// filter...

	return $parent_data_purchase_note;
}
$parent_data_purchase_note
-
$that
-

Where the hook is called

WC_Product_Variation::get_purchase_note()
(hook_prefix)purchase_note
woocommerce/includes/class-wc-product-variation.php 390
$value = apply_filters( $this->get_hook_prefix() . 'purchase_note', $this->parent_data['purchase_note'], $this );

Where in WP core the hook is used WooCommerce

Usage not found.