Need a legal advice (NOTE: After I'm completely satisfied with the genuine advice then I will award and close the project) — 2

I have created an Android App that organises online contest after every one hour or less than that in which e.g, every contest has 50 spots and about 25 or more winners. Users have to pay entry fee and when then contest period is over (contest countdown), the system automatically declare the winners. Now I want to know that is this app Legal in India?

If yes, then thank you.

If not, then please let me know how to make it legal? What is the procedure for it? How much it costs?

NOTE: I’m talking about all over India not specific states where it is legal.