Hi, I am not able to add funds in my apple ID

Hi aswin232

welcome to the Apple (user-to-user) Community.

Re: "Why I am not able to add funds in my apple ID ?"

This could be due to any one of several different reasons.

Wondering how you are trying to add funds,

and

if you are getting an error message that would point to the solution.

Eg: If you have disputed a charge from Apple you may need to authorise payments to Apple again from your financial institution, or debit / credit provider.

Else:

How to: Add money to your Apple Account balance - Apple Support

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You might want to check which payment methods you can use for Apple purchases in your country or region.

These (link below) are the payment methods that Apple can accept:

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

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If your credit/debit card is one that Apple accepts, you can list it in your Apple Account:

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

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If you are trying to add funds using Apple Gift Cards:

How to redeem your Apple Gift Card or App Store & iTunes gift card - Apple Support

If your gift card works with your Apple ID:

What you can buy with your Apple Gift Card or Apple Account balance – Apple Support 

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You may be trying to purchase something that is not available in your country or region:

Availability of Apple Media Services – Apple Support

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Trouble-shooting:

The "Related Article" above your question can help if your payment method is declined.

or

What to do: If your Apple ID is locked or disabled - Apple Support

or

What to do: If you're asked to confirm your Apple ID when you contact Apple - Apple Support

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If you wish: you can log-in to your Apple Account online and check or update your details there:

Apple ID Log-in 

https://appleid.apple.com

If needed: Get a verification code and sign in with two-factor authentication - Apple Support

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More support:

Apple ID support:

Apple ID - Official Apple Support

Billing and Subscriptions support Page

Subscriptions and Billing - Official Apple Support

or

Apple phone numbers around the world

Contact Apple for support and service - Apple Support

and

If your country is not listed: 

Apple Assistance:

Choose your country or region - Official Apple Support

All the best :-)