"code" has been added to API call getReasonCodes"reasonID" has been added to API calls getCampaigns"billingStatementID#" will accept the ID of a metered billing and will not return an error code."billingReadingIDs#". For API it is important to know which readings of the meter the invoice must be associated with."billingStatementID#" refers to an ordinary billing, parameter "billingReadingIDs#" must be omitted. Otherwise API will return error code 1013.