pinChatMessage

Use this method to add a message to the list of pinned messages in a chat
If the chat is not a private chat, the bot must be an administrator in the chat for this to work and must have the 'can_pin_messages' administrator right in a supergroup or 'can_edit_messages' administrator right in a channel

Parameters for pin-chat-message
Field Description
chat_id * Unique identifier for the target chat or username of the target channel (in the format @channelusername)
message_id * Identifier of a message to pin
business_connection_id Unique identifier of the business connection on behalf of which the message will be pinned
disable_notification Pass True if it is not necessary to send a notification to all chat members about the new pinned message
Notifications are always disabled in channels and private chats.