lib/bitpay/rest_connector.rb
def refresh_tokens
      response = get(path: 'tokens')["data"]
      token_array = response || {}
      tokens = {}
      token_array.each do |t|
        tokens[t.keys.first] = t.values.first
      end
      @tokens = tokens
      return tokens
    end
def refresh_tokens
      response = get(path: 'tokens')["data"]
      token_array = response || {}
      tokens = {}
      token_array.each do |t|
        tokens[t.keys.first] = t.values.first
      end
      @tokens = tokens
      return tokens
    end
Fetches the tokens hash from the server and
  updates @tokens