how do I find out what apps I am paying for

If you are asking about subscriptions.

Purchases - View, change, or cancel your subscriptions.        

Purchases - Subscriptions not billed through Apple  

Link to contact Apple Support at the end of the article.

Purchases - the subscription that you want to cancel is not listed   

If you are seeing charges for purchase that you don't know what they are for, see the Apple Support article(s) below. Link to contact Apple Support in the article.

Apple ID - If you see ‘itunes.com/bill‘ or an unfamiliar charge on your bank, credit card, or debit statement.