Contact
This object represents a phone contact.
Fields
phone_numberStringRequiredContact's phone number
first_nameStringRequiredContact's first name
last_nameStringOptionalOptional. Contact's last name
user_idIntegerOptionalOptional. Contact's user identifier in Telegram. This number may have more than 32 significant bits and some programming languages may have difficulty/silent defects in interpreting it. But it has at most 52 significant bits, so a 64-bit integer or double-precision float type are safe for storing this identifier.
vcardStringOptionalOptional. Additional data about the contact in the form of a vCard