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SurveyJS
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Hey, I'm talking about this issue here: https://github.com/Spice-King/foundry-swnr/issues/28
Just showing these costs would be cool, but maybe you could also take a look into integrating it into a module like Simple Calendar to mark the days when it has to be paid on a calendar and add a button to pay it, adding up otherwise (dont quite remember how that is handled in the source book). I mean it was really just an idea, if you were looking for more features people miss.