Update

1// Create a Map to store all the data of a Customer 2Map<String, Object> customerMap = new Map<String, Object>(); 3 customerMap.put('DisplayName','Weiskopf Consulting'); 4 customerMap.put('Id','1201'); 5 customerMap.put('SyncToken','0'); 6 7// Initializing the RequestJSON Data to be passed. 8Map<String, Object> requestJSONMap = new Map<String, Object>(); 9 requestJSONMap.put('customers', new List<Object>{customerMap}); 10 String reqJSON = JSON.serialize(requestJSONMap); 11 12Map<String, Object> reqObj = new Map<String, Object>(); 13 reqObj.put('version', '1.0'); 14 reqObj.put('action', 'updateCustomer'); 15 reqObj.put('requestJSON', reqJSON); 16 //Required, if QuickBooks Multi-Org is enabled in Breadwinner. 17 reqObj.put('qbOrgId', '4620816365285051610'); 18 19// Placing a request to Breadwinner Global API 20Map<String, Object> respMap = breadwinner_qbo.BreadwinnerQBAPI.call(reqObj); 21System.debug(respMap);