Update Customer

//  Create a Map to store all the data of a Customer
Map<String, Object> customerMap = new Map<String, Object>();
    customerMap.put('processorCustomerId', 'processorCustomerId');
    customerMap.put('customerName', 'Johnny Doe');
    customerMap.put('email', 'test@bwp.com');
    customerMap.put('customerPhone', '616-928-5099');

//  Create Stripe Address data
    customerMap.put('line1', '124 Main Street');
    customerMap.put('line2', 'Apt 3');
    customerMap.put('city', 'Anytown');
    customerMap.put('state', 'NY');
    customerMap.put('postal_code', '12346');

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

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

//  Placing a request to Breadwinner Global API
Map<String, Object> resp = bw_payments.BreadwinnerPaymentsAPI.call(reqObj);
System.debug(resp);