Hi,
As of now, there is no registration for Gratuity. There is a Form - A, which needs to be filled to be applicable for the Payment of Gratuity Act. After 5 years of your continuous service, it becomes a statutory obligation of the company for your gratuity amount.
For more information, you can refer to the official document at: [The Payment of Gratuity Rules](https://cdn2.stacowiki.in/media/filer_public/9a/d1/9ad1c33d-ef04-4cbc-bd4b-e9af490e63c1/thepaymentofgratuityrules.pdf).