So I got help on my problem. It turns out that params
was already a hash, and so I did not need to say :params => params
because that would be redundant.
Before
response = Nestful.post 'https://www.getpocket.com/v3/oauth/request',
:params => params,
:format => :json
After
response = Nestful.post 'https://getpocket.com/v3/oauth/request',
params,
:format => :json