lib/createsend/client.rb
def set_monthly_billing(currency, client_pays, markup_percentage,
      monthly_scheme = nil)
      options = { :body => {
        :Currency => currency,
        :ClientPays => client_pays,
        :MarkupPercentage => markup_percentage,
        :MonthlyScheme => monthly_scheme }.to_json }
      put 'setmonthlybilling', options
    end
def set_monthly_billing(currency, client_pays, markup_percentage,
      monthly_scheme = nil)
      options = { :body => {
        :Currency => currency,
        :ClientPays => client_pays,
        :MarkupPercentage => markup_percentage,
        :MonthlyScheme => monthly_scheme }.to_json }
      put 'setmonthlybilling', options
    end
Sets the monthly billing settings for this client.
 monthly_scheme must be nil, Basic or Unlimited