Dear abhisudh-44,
Customs is a government agency responsible for regulating shipments entering a country. All shipments being sent to and from a country must clear customs first.
Your logistic service provider will provide the applicable forms you'll need to fill out for international shipments. For more details please visit the following link:
https://www.ebay.com/help/selling/shipping-items/setting-shipping-options/international-shipping?id=...
You may also contact your tax advisor for further details on the custom charges and other duties that you need to pay.
Regards,
eBay IN CBT Team