def set_payg_billing(currency, can_purchase_credits, client_pays,
      markup_percentage, markup_on_delivery=0, markup_per_recipient=0,
      markup_on_design_spam_test=0)
      options = { :body => {
        :Currency => currency,
        :CanPurchaseCredits => can_purchase_credits,
        :ClientPays => client_pays,
        :MarkupPercentage => markup_percentage,
        :MarkupOnDelivery => markup_on_delivery,
        :MarkupPerRecipient => markup_per_recipient,
        :MarkupOnDesignSpamTest => markup_on_design_spam_test }.to_json }
      put 'setpaygbilling', options
    end
def set_payg_billing(currency, can_purchase_credits, client_pays,
      markup_percentage, markup_on_delivery=0, markup_per_recipient=0,
      markup_on_design_spam_test=0)
      options = { :body => {
        :Currency => currency,
        :CanPurchaseCredits => can_purchase_credits,
        :ClientPays => client_pays,
        :MarkupPercentage => markup_percentage,
        :MarkupOnDelivery => markup_on_delivery,
        :MarkupPerRecipient => markup_per_recipient,
        :MarkupOnDesignSpamTest => markup_on_design_spam_test }.to_json }
      put 'setpaygbilling', options
    end
Sets the PAYG billing settings for this client.