Hey Oemmi!
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Matchmaking is not currently in scope for this project, however it is something that could be implemented within the toolkit by simply changing how games are selected. The toolkit does have access to games which it has found and adding the functionality to find and connect players based on available games would not be hard to do. I can give direction on this if you do choose to pickup the toolkit.
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Adding support/implementing an option like MySQL would definitely be great to have. The toolkit was designed to be accessible and use only blueprints and engine features, this is mainly for accessibility and getting things running as soon as you hit the ground. There is one or a few options on the marketplace (Plugins) which could be used to add a login option to your project, and I’m sure there are many in the works aswell!
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Decks are saved locally. The functions used to save out the deck had been created in function libraries which could easily be changed to load/save decks to a database (blueprint callable) with little changes needed to be made.
Let me know if you have any further questions!