Hi neeraj.yathy,

Thank you so much for your interest in supporting Khan Academy! Your help is greatly appreciated!

Unfortunately, we're only able to accept direct donations in US Dollars, which is likely why you're seeing an error when you attempt to pay using a card. However, donations made using PayPal are automatically converted to US dollars, so as long as the payment is processed via PayPal you should be able to use a debit card through that platform.

If you have any other donation questions, I encourage you to reach out to us at donate@khanacademy.org. 

Thanks again for your support! Please let me know if there's anything else I can help you with!