To override the Content-type in your clients, use the HTTP Accept Header, append  the .csv suffix or  ?format=csv
        
        HTTP + CSV
         The following are sample HTTP requests and responses. 
            The placeholders shown need to be replaced with actual values.
POST /Bills/{BillID}/Outputs HTTP/1.1 
Host: api.jiwa.com.au 
Accept: text/csv
Content-Type: text/csv
Content-Length: length
{"BillID":"String","ItemNo":0,"InventoryID":"String","PartNo":"String","Description":"String","IsRatio":false,"Quantity":0,"Note":"String","IsPrimary":false,"CostPercentage":0,"Cost":0,"LastCost":0,"CustomFieldValues":[{"SettingID":"String","SettingName":"String","Contents":"String","PluginID":"String","PluginName":"String"}]}
 
HTTP/1.1 200 OK
Content-Type: text/csv
Content-Length: length
{"OutputID":"String","ItemNo":0,"InventoryID":"String","PartNo":"String","Description":"String","IsRatio":false,"Quantity":0,"Note":"String","IsPrimary":false,"CostPercentage":0,"Cost":0,"LastCost":0,"CustomFieldValues":[{"SettingID":"String","SettingName":"String","Contents":"String","PluginID":"String","PluginName":"String"}]}