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In short,
I bought a module from this "developer" because he agreed to help me on integrating it into my site. But, then I didn't a satisfactory answer, and after few more emails he/she just stopped responding.
Before purchasing the module I asked the dev if a refund would be acceptable if no way to integrate it into my store, and said: yes, no problem.
Now, It's been more than a month, and I still haven't received a reply to my multiple emails sent. So MONEY LOST.
I would not recommend anyone that should need help to buy any module from them.