Module

x/grammy/mod.ts>Api#unpinAllForumTopicMessages

The Telegram Bot Framework.
grammyjs/grammY
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method Api.prototype.unpinAllForumTopicMessages
import { Api } from "https://dotland.deno.dev/x/grammy@v1.12.0/mod.ts";

Use this method to clear the list of pinned messages in a forum topic. The bot must be an administrator in the chat for this to work and must have the can_pin_messages administrator right in the supergroup. Returns True on success.

Parameters

chat_id: number | string

Unique identifier for the target chat or username of the target supergroup (in the format @supergroupusername)

message_thread_id: number

Unique identifier for the target message thread of the forum topic

optional
signal: AbortSignal

Optional AbortSignal to cancel the request

Official reference: https://core.telegram.org/bots/api#unpinallforumtopicmessages