Android - how to create POS (Point Of Sale) system : <p>I'm trying to make a prototype Android POS System. I know how to code but don't have much knowledge about commerce, trade, transactions or what is the financial flew in restaurants, mobile shops or super markets. this would help creating a robust database and app functions. So, here are some questions..</p>

<ol>
<li>how could I get some knowledge about trade functions needed to be applied into the POS System?</li>
<li>what is needed to jump start and boost developing the system?</li>
<li>is there a plugins that I can make use of? and how to use if "yes"?</li>
</ol>

<p>Your Advice is highly appreciated! </p>
