View Source ExTDLib.Object.StorePaymentPurposeGiftedPremium (ExTDLib v0.0.4)

The user gifting Telegram Premium to another user.

Name	Type	Description
user_id	string	Identifier of the user to which Premium was gifted.
currency	string	ISO 4217 currency code of the payment currency.
amount	string	Paid amount, in the smallest units of the currency.

More details on telegram's documentation.