Optional
expiryTime at which the subscription expired or will expire unless the access is extended (ex. renews).
A timestamp in RFC3339 UTC "Zulu" format, with nanosecond resolution and up to nine fractional digits. Examples: "2014-10-02T15:01:23Z" and "2014-10-02T15:01:23.045123456Z".
Optional
productThe purchased product ID (for example, 'monthly001').
Item-level info for a subscription purchase.