To do International shipping, you require an IE code.
Import Export Code (also known as IEC) is a 10 digit identification number that is issued by the DGFT (Director General of Foreign Trade), Department of Commerce, Government of India. It is also known as Importer Exporter Code. It is mandatory for companies and businesses to obtain this code to start a business that deals with import and export in the Indian Territory. It is not possible to deal with export or import business without this code.
You can get it from the nearest zonal or regional office.
To know more about IE code, read our detailed guide here