How to reactivate my canceled subscription?

If your subscription was marked for the cancelation using the API and it was not canceled yet, because your billing period date was not passed, then you can still reactivate it using the API call: https://docs.coinapi.io/management/subscriptions#reactivate-get

If your subscription was marked for cancelation and was canceled at your billing period date, then you must acquire a new subscription from our Pricing page or contact support.