Way to make Tournament app secure

Hello koders, I made a tournament app if I was not wrong tournament apps rules should be read and write to true. (Kindly correct me if I was wrong)
Is there any best way to secure the app from hacker? To access the database (hiding database url and token)
Kindly reply your ideas and solution.
Thank you so much

Have you tried with obfuscated text method? Which will give different format if anyone try to read your url

I think its not 100% secure… is it??

Use Firebase authentication, and change firebase rules

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i cant understand much more about rules which is not enough. can you help me on that

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