Create

 //  Create a Map to store all the data of a Contact
Map<String, Object> nsContact = new Map<String, Object>();
    nsContact.put('firstName', 'James');
    nsContact.put('lastName','Williams');
    nsContact.put('subsidiary', new Map<String, Object>{'internalId'=>'1'});
    nsContact.put('email', 'james@grandhotel.com');
    nsContact.put('company', new Map<String, Object>{'internalId'=>'32342'});
    nsContact.put('phone', '3453254543');
    nsContact.put('officePhone', '6546564564');
    nsContact.put('title', 'CEO');
    nsContact.put('isPrivate', true);

//  Initializing the Contact Custom Fields
    List<Object> conCustomFieldList = new List<Object>();
    Map<String, Object> conCustomField1 = new Map<String, Object>();
        conCustomField1.put('fieldType', 'boolean');
        conCustomField1.put('scriptId', 'custentity_f3_mm_send_wf_sms');
        conCustomField1.put('value', 'true');
        conCustomFieldList.add(conCustomField1);
    Map<String, Object> conCustomField2 = new Map<String, Object>();
        conCustomField2.put('fieldType', 'string');
        conCustomField2.put('scriptId', 'custentity_alt1_email');
        conCustomField2.put('value', 'james12@gmail.com');
        conCustomFieldList.add(conCustomField2);

//  Adding the Contact Custom Fields
    nsContact.put('customFieldList', new Map<String, Object>{'customField'=>conCustomFieldList});

//  Initializing the Contact Addresses
    List<Object> addressBookList = new List<Object>();
    Map<String, Object> addressBook = new Map<String, Object>();
    Map<String, Object> addressbookAddress = new Map<String, Object>();
        addressbookAddress.put('addr1', 'Suite 201');
        addressbookAddress.put('addr2', '2334 Park Street Avenue');
        addressbookAddress.put('city', 'Chicago');
        addressbookAddress.put('state', 'IL');
        addressbookAddress.put('country', '_unitedStates');
        addressbookAddress.put('zip', '60601');
        
        addressBook.put('addressbookAddress', addressbookAddress);
        addressBook.put('defaultBilling', true);
        addressBook.put('defaultShipping', true);
        
        addressBookList.add(addressBook);
    
    nsContact.put('addressbookList', new Map<String, Object>{'addressbook'=>addressBookList}); 

//  Initializing the RequestJSON Data to be passed.
Map<String, Object> requestJSONMap = new Map<String, Object>();
    requestJSONMap.put('contacts', new List<Object>{nsContact});
    String reqJSON = JSON.serialize(requestJSONMap);

Map<String, Object> reqObj = new Map<String, Object>();
    reqObj.put('version', '1.0');
    reqObj.put('action', 'createContact');
    reqObj.put('requestJSON', reqJSON);

//  Placing a request to Breadwinner Global API
Map<String, Object> resp = breadwinner_ns.BreadwinnerNetSuiteAPI.call(reqObj);