I need to request a refund on Apple Pay account

Apple has taken $53.36 out of my Apple Pay account

See the following Apple articles:

See your Apple Pay transaction history

See your Apple Pay transaction history - Apple Support

Get a refund for purchases made with credit or debit cards using Apple Pay

Get a refund for purchases made with credit or debit cards using Apple Pay - Apple Support

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without my authorization or approval.

If other people have access to your iPhone or other Apple device, change the device passcode and never share it with others.

Change your Passcode -> Use a passcode with your iPhone, iPad, or iPod touch - Apple Support

Change your Apple ID password -> Change your Apple ID password - Apple Support

• Create a strong password for your Apple ID, It is best if your password consists of eight or more characters and include upper and lowercase letters, and at least one number. You can also add extra characters and punctuation marks to make your password even stronger. 
• Never provide your password, passcode, security questions, verification codes, recovery key or any other account security details to anyone else. Apple will never ask you for this information.

Then see this Apple article: What to do after you change your Apple ID or password

What to do after you change your Apple ID or password - Apple Support

(if you haven't already done this) Two-factor authentication for Apple ID -> Two-factor authentication for Apple ID - Apple Support

OK.

Then see the following Apple articles:

See your Apple Pay transaction history

See your Apple Pay transaction history - Apple Support

Get a refund for purchases made with credit or debit cards using Apple Pay

Get a refund for purchases made with credit or debit cards using Apple Pay - Apple Support

Track orders and purchases in Apple Wallet

Track orders and purchases in Apple Wallet - Apple Support

If you see "apple.com/bill" on your billing statement

If you see "apple.com/bill" on your billing statement – Apple Support (UK)

If you still need help, get support from Apple directly -> Get Support or call Apple in your region see -> Contact Apple for support and service or check -> here for more support and assistance.