Execute Jolt transaction from outside PeopleSoft Application server. What kind of Payload does it accept?

gistfile1.txt

String host = "AppServer";	
String port = "9000";	
String oprid = "PS";	
String client = "JoltPing";	
String joltPwd = "password";	
byte[] data = "who goes there?".getBytes();	
	
try {	
	
    JoltSessionAttributes jsa = new JoltSessionAttributes();	
    jsa.setString(jsa.APPADDRESS, "//" + host + ":" + port);	
    jsa.setInt(jsa.IDLETIMEOUT, 3000);	
    jsa.setInt(jsa.SENDTIMEOUT, 3000);	
    jsa.setInt(jsa.RECVTIMEOUT, 3000);	
	
    System.out.println(jsa.JoltClientVersion().toString());	
    	
    session = new JoltSession(jsa, oprid, client, null, joltPwd);	
    	
    if (session.isAlive()) {	
        /*    	
            // This works for GETALL, but doesn't work for GetCertificate because 	
            // I have no idea what payload should look like	
            service = new JoltRemoteService(".GETALL", session);	
            service.setString("PATTERN", "SVC/[A-Z]*");	
        */	
        service = new JoltRemoteService("GetCertificate", session);	
        service.setBytes("PURCHASE", data, data.length);	
	
        System.out.println("Jolt Service Name: " + service.getName());	
        System.out.println("Jolt Service Type: " + service.toString());	
	
        service.call(null);	
        service.done();	
        session.endSession();	
    }	
    	
} catch (SessionException sessionExeption) {	
    System.err.println(sessionExeption);	
} catch (ServiceException serviceException) {	
    System.err.println(serviceException);	
    session = null;	
} catch (ApplicationException applicationException) {	
    System.err.println(applicationException);	
    service = null;	
    session = null;	
}	

Notice "PURCHASE" parameter. Somebody has been really lazy renaming the delivered parameters in the example code while designing PeopleSoft 3-tier transactional code in the 1990s. And it's still here in the jrepository catalog in 2016. Unbelievable....

Anyone knows what i can throw into "data" in this -> byte[] data = "who goes here?".getBytes(); Anything i tried so far, simply generates bea.jolt.ApplicationException: TPESVCFAIL - application level service failure