How can I transfer money from iTunes to Apple Pay

How can I transfer money from iTunes

If you mean from your Apple ID balance, then it is not possible, see -> Check your Apple ID balance

Check your Apple ID balance – Apple Support (UK)

scroll to ⤵️

If you have Apple ID balance you can't use.

You can't redeem or return Apple Gift Cards, App Store & iTunes Gift Cards or unused Apple ID balance for cash, except as required by law. If your jurisdiction allows the refund of redeemed gift balances, you can contact Apple Support to request a refund. 

When you contact Apple, include the following information:

•           Your Apple ID.

•           The refund amount.

•           Your current delivery address.

to Apple Pay

Apple Pay is the way to pay. It replaces your physical cards and cash with a method of payment that is private, easier and safer. Whether you pay in a store, on a website or in an app. This is the new payment.

it is actually the same as paying contactless with your bank card, only via the iPhone.

See -> Use Apple Pay for contactless payments on iPhone

Use Apple Pay for contactless payments on iPhone – Apple Support (UK)

Learn where to use Apple Pay

Learn where to use Apple Pay - Apple Support

Make purchases using Apple Pay. 

Use Apple Pay in apps, App Clips, and Safari on iPhone

Use Apple Pay in apps, App Clips, and Safari on iPhone – Apple Support (UK)

If you mean Apple Cash, see Set up Apple Cash

Set up Apple Cash - Apple Support

• Be at least 18 years old and live in the United States.

See -> Transfer money from Apple Cash to your bank account.

It cannot be done. Your Apple Account (iTunes) balance cannot be moved, only spent.

From this Apple article-

You can't redeem or return Apple Gift Cards, App Store & iTunes Gift Cards or unused Apple Account balance for cash, except as required by law.