How to request a refund for an accidental Telegram subscription paid via Apple Pay?

Follow the steps mentioned in this article to request a refund from Apple:

Request a refund for apps or content that you bought from Apple - Apple Support

If you subscribed directly through the website of the developer of the app, and the subscription is not listed under your subscriptions in Settings/Your Name/Apple Account/Subscriptions, you should contact the developer of your app about that, as explained in this article:

How to contact an app developer - Apple Support

If you actually clicked on a button labeled Apple Pay, when you checked out, you need to request the refund directly from the merchant.

If you subscribed via an in app link or via the Apple App Store, you request the refund from Apple using the link below.

Subscriptions and Billing - Official Apple Support