title: How to make a secure Online shop
body: <p>I plan to run an online shop and will write script by myself (I'm php developer). However,my worries are:</p>
  
  <ol>
  <li>How to ensure the secure payment online?</li>
  <li>To ensure the application safe, if need to buy a server to host app rather than using shared hosting?</li>
  <li>How to prevent hacker to change data in the database (i.e. price, content)?</li>
  </ol>
  
  <p>Any sugeestions are welcomed.</p>