@Ayushi Srivastava one has to register their establishment under Payment of Gratuity. Sharing the Act with you for your reference. For more specifications - you should refer to Payment of Gratuity Rules, available on Simplance.
Snapshot here for your reference -
Notice of opening, change or closure of the establishment (1) 1Within thirty days of the rules becoming applicable to an establishment, a notice in Form 'A' shall be submitted by the employer to the controlling authority of the area. (2) A notice in Form 'B' shall be submitted by the employer to the controlling authority of the area within thirty days of any change in the name, address, employer or nature of business. (3) Where an employer intends to close down the business he shall submit a notice in Form 'C' to the controlling authority of the area at least sixty days before the intended closure.