public class ProcessHandlerShowAccounts {
    public class AccountParameter {
        @InvocableVariable(required=true)
        public Id accountId;
        @InvocableVariable(required=true)
        public String name;
    }

    @InvocableMethod(label='handleNewAccounts' description='Send the Accounts variables passed from Process Builder to the webservice')
    public static void handleNewAccounts(AccountParameter [] accountParameters) {
        //I am unable to see the debug
        System.debug('Account ID VALUE: '+ accountParameters[0].accountId);
        System.debug('Name Value: '+accountParameters[0].name);
        webServiceCallOut(accountParameters[0].accountId,accountParameters[0].name);
    }

    @future(callout=true)
    public static void webServiceCallOut(ID n, String a) {
        Http http = new Http();
        HttpRequest req = new HttpRequest();
        HttpResponse res = new HttpResponse();

        req.setEndpoint('https://namer/Accounts'+' sfdcid='+n+'&operation='+a);

        String username = 'test';
        String password ='123';
        Blob headerValue = Blob.valueOf(username + ':' + password);
        String authorizationHeader = 'BASIC ' + EncodingUtil.base64Encode(headerValue);

        req.setHeader('Authorization', authorizationHeader);
        req.setMethod('POST');
        //Create a new Http object to send the request object
        //a response object is generated as a result

        try {
            res = http.send(req);

            if(res.getStatus()=='200') {
                System.debug('GET BODY: '+ res.getBody());
            } else {
                System.debug('GET Status Else: '+res.getStatus());
            }
        } catch(System.CalloutException e) {
            System.debug('Callout error: '+ e);
            System.debug(res.toString());
        }
    }
}