If you notice, there are more and more free applications, but there is some kind of currency (gold, fake money, etc.) that you can buy or earn for free. I'm interested in this free payment system.
Namely, you get a pop-up window like "Download and run the XY application, and you will earn 5 gold coins." Therefore, I download the application and run it once, then I switch back to the application and immediately get 5 gold points.
Is there any useful system that they use or each of them implements its own?
If they implement their own, how do they check if the XY application was installed and started?
As I see it, if I have to implement it myself, I contact the owner of the XY application and ask him to embed a sample code into the splash of his application / game. When his application starts, send the OK flag to my online database. Another service immediately pushes a notification to my application, and the application knows that some user has installed and launched the XY application. But I don’t know what should I do if there is no Internet connection in the first run of the XY application ?
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