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Lock Your Chats Bot API: lets you build programs that use Telegram messages for an interface. You don’t need to have knowledge of MTProto encryption protocol. The intermediary server will handle all communication and encryption with Telegram API for you. Voice messages can be converted to text for those times you don't want to listen, but want to see what it says. You can rate transcriptions to help improve them.

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Telegram offers two types of APIs for developers. Both are free of charge. 5 Cool Telegram Messenger Tricks You Should Know Infinite Reactions Improved Login Flow

My Contacts: Allow only your contacts to view your profile. Lock Your Chats 1b