To cancel your ChatGPT subscription, make sure you do it through the same...

https://iris-wiki.win/index.php/What_if_the_Stripe_Billing_Portal_Never_Opens_for_ChatGPT%3F

To cancel your ChatGPT subscription, make sure you do it through the same channel you used to subscribe—whether that’s the web, Stripe, Apple, Google Play, Business, or API