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method Context.prototype.unpinAllForumTopicMessages
import { Context } from "https://dotland.deno.dev/x/grammy@v1.18.2/mod.ts";

Context-aware alias for api.unpinAllForumTopicMessages. 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

optional
signal: AbortSignal

Optional AbortSignal to cancel the request

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