Cool Idea(Just think about it)

A cool Christmas gift or new game feature in which you could get credits usable in the unit store would be awesome. Essentially allowing you to purchase bundles in the in game store. Being able to save them for like in an game sale (July 4th etc.) Just a weird concept that popped up in my head. Call them contest credits or something!
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You're asking for a free currency (something earned through free game play) that allows you to NOT purchase, but still receive, the only things in the game that provide monetary value, which keeps the game running.
Effectively what you're asking for is to shut down the game, or flood it with ads. Personally I'm not a fan of either.
I would suggest asking friends and family to give you google play or apple store gift cards for the holidays. That will let you purchase those things items for free.
We also already have a feature called contest credits, but I don't think you want them as a Christmas gift.
I say magically because unless the player tells Kabam through some voluntary channel, Kabam has no idea who you are or how to go about sending you anything. You don't even technically need to give them an email address to play the game (they ask for one if you make a Kabam ID, which is recommended but not mandatory), much less any other personally identifying information. Kabam cannot ask Apple or Google to contact players for them, because this would violate the platform's privacy policies.
Although it is Kabam's stuff in there, the in-app purchase store is not a Kabam store and they don't control how people buy things from it. They cannot give players a unit store "credit" of any kind in-game. The only way this could possibly work is if Kabam set up some other store where you could spend some other currency that they awarded, which paralleled the in-app purchase stores.
But then that just becomes the in-game stores where you can buy stuff with units. Units are the intermediate currency that players can exchange cash for, and that Kabam can separately award to the player. That's essentially why units exist.
It's just a joke kabam, don't get me banned for this☠️