In trying to understand some continued weirdness regarding badge/reputation rewarding in the context of private API participation I failed to find the explanation what exactly constitutes 'active participation', even though I recall that I read it somewhere sometimes. The badges page only states:
API Beta: Participated in the private API beta; +2000 rep bonus
API Evangelist: Actively participated in the private API beta; +4000 rep bonus
Does someone recall or know what has been considered 'active participation'?