Remove references to promo codes from the Charge class Fixes https://github.com/MidwestFurryFandom/art_show/issues/27. We accidentally copied over some code that references a model that doesn't exist in our codebase.
Remove references to promo codes from the Charge class
Fixes https://github.com/MidwestFurryFandom/art_show/issues/27. We accidentally copied over some code that references a model that doesn't exist in our codebase.

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