Hello Bach.
Ofcourse you can not have Joomla admin login!?
And you should not take money from customers, and not deliver on a product either.
The product must at least have some kind of documentation on how to use/configure.
And to ask customers for Joomla admin login becouse customers have to troubleshoot after install is just not acceptable.
I learned that this script is free out there, you've just made a Joomla admin GUI for it, packed it down, and charges $12 for it.
(I see that others sells the same product for $3 )
In the time I´ve been waiting for you to answer me, I have made my own Messenger API, and got a script that works perfectly.
The reason why I bought your product in the first place was to save some time, NOT doing just that.
As we see that didn't pan out, so that´s $12 straight out the window.
I dont think there is anything you can do, or that a want you to do for me,
You have a great day now.