title: how to get shopee api Authorization use php5.3
body: <p>i want to get <strong>shopee authorization</strong> using the source code.
  The language I use is php.5.3.2.
  No matter how many times I search, I only have a demo about the higher version, so I can't find the answer I want to ask.</p>
  
  <p>In shopee, you can calculate the default signature sequence and partner key value as "HMAC-SHA256" and create an autorization value. How can I write it in code?</p>
  
  <p>i already get partner key.. but i don't know how to get authorization.</p>