We often get requests from users asking us what they have purchased or if they can change or edit their subscriptions.
As app developers we are completely blinded to any and all accounting and licensing of customer information from Apple with our clients. We can not verify any purchases or subscriptions from our end.
However, you can do this quite easily.
From PostureScreen you can do the following: https://youtu.be/ZhZwITGTfr0
Here is the official Apple tutorial on how to Verify, Cancel or Edit Subscriptions: https://support.apple.com/en-us/HT202039
Here is how to View your purchase history, this is important as many people have multiple Apple accounts and forget which account made the subscription purchases, etc.: https://support.apple.com/en-us/HT204088