Is there any framework/plugin to use to implement mailbox in game?

Hi all, I trying to find out is any framework/plugin that can be use to implement gift inbox in game.

The reason why I want to implement this is due to sometime when we, developers screw up. We would like to have a way compensate our player with some gems or items.

I tried to search around and here is what I got so far.

1. https://www.ktplay.com/en/
   
2. Playfab where by they sort of hack it and make it works https://community.playfab.com/questions/36043/gift-inbox.html

Is there any other frameworks that can help me on this. Please suggest, thanks in advance.

 

Here are some of the liveops tools that I can find of over this few days,

https://gameanalytics.com/toolbox/backend-liveops

Please suggest if there you guy hav better recommendation