Why was I charged $15.89. I don't have any subscriptions, and I made no purchases.

This is primarily a user-to-user support forum; other Apple users like you. We don't have access to information about charges to your account. Apple has a support article about charges — see each of the steps in the following instructions. They include information on contacting Apple Support if the other steps don't help: If you see 'apple.com/bill' on your billing statement - Apple Support

or go to Subscriptions and Billing - Official Apple Support

If the only indication of the charges is from an email, be aware that it may be a phishing attempt to get you to log in to a site that appears to be Apple and divulge your password or credit card information. See information in the Apple articles Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

and https://support.apple.com/en-us/HT201679

UnexplainedCharge Said:

"Why was I charged $15.89? I don't have any subscriptions, and I made no purchases."

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What to do...

Secure your Account:

A. Verify your Devices:

Verify that all devices are logged in to your account, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support

B. Modify your Credentials:

Having gotten a phishing same, someone lily has your credentials. So, by all means, go about modifying them.

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option