Three-letter ISO 4217 currency code, or "XTR" for payments in Telegram Stars
Product description
Unique bot deep-linking parameter that can be used to generate this invoice
Product name
Total price in the smallest units of the currency (integer, not float/double). For example, for a price of US$ 1.45 pass amount = 145. See the exp parameter in currencies.json, it shows the number of digits past the decimal point for each currency (2 for the majority of currencies).
This object contains basic information about an invoice.