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function is not described

WC_Coupon_Data_Store_CPT::add_coupon_used_by() private WC 1.0

Helper function to add a _used_by record to track coupons used by the user.

{} It's a method of the class: WC_Coupon_Data_Store_CPT{}

No Hooks.

Return

null. Nothing.

Usage

// private - for code of main (parent) class only
$result = $this->add_coupon_used_by( $coupon, $used_by, $coupon_held_key );
$coupon(WC_Coupon) (required)
Coupon object.
$used_by(string) (required)
Either user ID or billing email.
$coupon_held_key(string) (required)
(Optional) Update meta key to _used_by instead of adding a new record.

Code of WC_Coupon_Data_Store_CPT::add_coupon_used_by() WC 5.8.0

private function add_coupon_used_by( $coupon, $used_by, $coupon_held_key ) {
	global $wpdb;
	if ( $coupon_held_key && '' !== $coupon_held_key ) {
		// Looks like we added a tentative record for this coupon getting used.
		// Lets change the tentative record to a permanent one.
		$result = $wpdb->query(
			$wpdb->prepare(
				"
				UPDATE $wpdb->postmeta SET meta_key = %s, meta_value = %s WHERE meta_key = %s LIMIT 1",
				'_used_by',
				$used_by,
				$coupon_held_key
			)
		);
		if ( ! $result ) {
			// If no rows were updated, then insert a `_used_by` row manually to maintain consistency.
			add_post_meta( $coupon->get_id(), '_used_by', strtolower( $used_by ) );
		}
	} else {
		add_post_meta( $coupon->get_id(), '_used_by', strtolower( $used_by ) );
	}
}