Deletes a contact.
Deleting a contact permanently removes them from the Contact List.
If a contact is also a site member or site contributor, or has a valid billing subscriptions, the contact cannot be deleted. The related site member or site contributor must first be deleted and any valid billing subscriptions must be canceled, before the contact can also be deleted.
Members are typically associated with a contact, each having a distinct member and contact ID. When passing the ID as a parameter, avoid presuming the IDs are identical since they represent separate entities.
You can only call this method when authenticated as a Wix app or Wix user identity.