A contact conversion records one time a contact reached a conversion. It is added when one of the conversion's triggers fires for the contact, for example a tracked event, a visited URL, an automation step or an e-commerce order. It keeps the amount and currency booked at that moment. Returns one entry by its id, even when its conversion is hidden. Entries with no order are left out when the account lacks deals, e-commerce data or site messages, or the API user's group lacks the deals permission. Entries made by an order are left out when the account lacks e-commerce data. Returns 404 if no entry has the id, or if the entry is left out this way.