Was the $9.99 purchase that was made using my Apple ID for a new subscription or a previous monthly revolving subscription

The support article "If you see 'apple.com/bill' on your billing statement" explains how you can check your iTunes and App Stores purchase history, cancel subscriptions, and track possible sources of unrecognized Apple charges you may see on a bill. These may be purchases by family members if you are an organizer of a Family Sharing group, or possibly a second Apple ID you use. The article also provides a specific link for contacting Apple if you cannot trace the source of charges. Click on this link to read this article ➞ https://support.apple.com/HT201382

Normally, all sales are considered final, but you can ask for a refund.

If you have received a confirmation email, click the Report a problem link at the bottom.

Purchases problem.      

How long refunds from the App Store or other Apple services take.  

I paid for a subscription that was free for 2 days for a trial. I wish to undo the $9.99 purchase please.

I did not know how to properly use the app that I was paying for. Inasmuch as it was just a few minutes

ago, I would like for you to reverse the purchase and refund the $9.99 to the card on which it was charged.

I look forward to your response.

Thank you.