Сигнатура формируется в ловеркейсе, тогда как приходить в верхнем регистре. #4
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https://github.com/ZeroOneStudio/rubykassa/blob/master/lib/rubykassa/notification.rb#L18
Результат:
"2EDA28FE398EA1C84FA2F6D86B5F35E9"
"2eda28fe398ea1c84fa2f6d86b5f35e9"