code: def transfer_credits(credits, can_use_my_credits_when_they_run_out)
        options = { :body => {
          :Credits => credits,
          :CanUseMyCreditsWhenTheyRunOut => can_use_my_credits_when_they_run_out
        }.to_json }
        response = post 'credits', options
        Hashie::Mash.new(response)
      end
docs: Transfer credits to or from this client.
  
   credits - An Integer representing the number of credits to transfer.
     This value may be either positive if you want to allocate credits from
     your account to the client, or negative if you want to deduct credits
     from the client back into your account.
   can_use_my_credits_when_they_run_out - A Boolean value representing
     which, if set to true, will allow the client to continue sending using
     your credits or payment details once they run out of credits, and if
     set to false, will prevent the client from using your credits to
     continue sending until you allocate more credits to them.
  
   Returns an object of the following form representing the result:
   {
     AccountCredits # Integer representing credits in your account now
     ClientCredits # Integer representing credits in this client's
       account now
   }