Specifies a requirement that must be satisfied in order to contact a user.
| Constructor | Description | 
|---|---|
| requirementToContactEmpty | This user can be freely contacted. | 
| requirementToContactPremium | This user requires us to buy a Premium subscription in order to contact them. | 
| requirementToContactPaidMessages | This user requires us to pay the specified amount of Telegram Stars to send them a message, see here ยป for the full flow. |