I am able to use the create_customer_profile() method, which creates a profile on my authorize.net sandbox site... but in the console i get a nil response.

If i do some debugging in the send() function i can see a 200 response:

from the rails console - this creates a valid customer profile in CIM

2.1.2 :001 > p = AUTHORIZECIM.create_customer_profile({:merchant_id=>"2",:email=>"[email protected]"})
RESPONSE = #<Net::HTTPOK 200 OK readbody=true> 
BODY = #

 => nil 

config/initializers/authorize_cim.rb

if Rails.env == 'development'
  ::AUTHORIZECIM = AuthorizeCim.new(
   :login => "XXX",
   :key => "XXXXXXXXX",
   :endpoint => :test
  )
end