Apple Pay

Re: "How to pay my applepay outstanding amount? I can’t purchase anything without paying my apple pay"

Apple Pay merely transfers $ from your credit or debit cards in wallet to merchants and websites etc.

There is no account as such.

How to: Set up Apple Pay - Apple Support explains how to add cards to wallet for Apple Pay.

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For Apple ID account: for purchases, subscriptions etc, from Apple (App Store, iTunes, Music, iCloud etc.)

Find out how to pay an unpaid order.

If a message says 'billing problem with previous purchase' or 'verification required' - Apple Support

or

What to do: If your payment method is declined in the App Store or iTunes Store - Apple Support

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If needed: How to: Add a payment method to your Apple ID - Apple Support

and

See which payment methods that Apple can accept in your country or region:

Payment methods that you can use with your Apple ID - Apple Support