hi @tkolhar ,
a Q: what you would do if there would be a need of a method with 3 activation keys, or for N ?

I suggest two approaches here: 
1. define just 1 String parameter, and provide the keys in comma-separated format
2. provide and "String[] keys" argument (so it can work for al 1..N values)

I will keep this PR open waiting to your update, ok ?