I purchased a subscription on the website, and accidentally subscribed again in-app.

No worries! To cancel the extra, unneeded subscription, follow these steps:

1. Head to account.sagomini.com and sign in with your Sago Mini account. 
2. In the “Manage Subscriptions” pop up, tap your current plan to open. 
3. Click ‘Cancel Subscription’ > ‘Confirm Cancellation’.