I'm kinda surprised by most of my friends didn't know about that so I guess some of you may also not know.
There is an offer by google pay which enables you to get up to 120 $$ that you can use on google play by using google pay. You can use that cash for premium items in-game.
To begin clearly: if you enter one of the codes below, both of us get the $10 so you get profits for this. If you don't use any code while registering your account, you're not getting the profit.
Step 1 - First you need to download Google Pay app from app store.
Step 2 - You will get first 10$ if you have a code. You will need to register using the code and then make the first payment using Google Pay. You can use this code: GA2135AE. If you are already registered in Google Pay you can write the code from menu (top left corner - enter code). You can find examples of where to pay by Google Pay in app.
If you don't have any code inserted before your first transaction it won't work.
Step 3 - After that you can do 4 more payments in different days and you will receive another 10$ for that. You can buy whatever you want - it can cost even a few cents.
Step 4 - After that you can invite 10 of your friends to do the same steps as you've done and receive 10$ for each one.
Final Step - So in total you can earn 120$. It's quite good amount for such an easy task, I think. You pay everyday anyway right?
I hope some of you find it helpful. Cheers!