Telegex.pin_chat_message

You're seeing just the function pin_chat_message, go back to Telegex module for more information.
Link to this function

pin_chat_message(chat_id, message_id, optionals \\ [])

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Specs

pin_chat_message(integer() | String.t(), integer(), [
  {:disable_notification, boolean()}
]) :: {:ok, boolean()} | {:error, Telegex.Model.errors()}

Use this method to pin a message in a group, a supergroup, or a channel. The bot must be an administrator in the chat for this to work and must have the 'can_pin_messages' admin right in the supergroup or 'can_edit_messages' admin right in the channel. Returns True on success.