There are many daily credit plugin, but one of my clients requested a new one, which gives you the credit reward, if you have completed your daily required playtime (can be set in cfg). Basically every single day your players has to play that x minutes to collect that y credits.
The code is fully commented, so you can possibly learn from it.
No database used in the project. Only protected cookies.
Zeph-store and Shop-Core supported with credits