I don't know if I get your question right. I assume that you're asking about the "user settings section", where the user can click on "My Payment" or something else.
In this case the first and most important thing is to show if the user has an active "premium" account or paid for the service (on-off payment or subscription).
Which product bought the user?
(optional) Link to a list of premium functions
Date + time of payment
Price + currency
(if Subscription) next renewal date + time
Paid with: "Credit card".... (please do not show the credit card number :) )
Link to the invoice
If the user didn't buy any product, then just show some text informing the user about his "FREE usage" or something else.
And most important to show some upselling teaser. Show what the user can get if he buy your product + measure link to get a conversion rate.