title: PayPal IPN - Auto return
body: <p>I'm developing a merchant website and I'm working with Paypal right now.
  I found that using IPN and the auto return do the job I want.</p>
  
  <p>I'm using NGROK to expose my localhost and everything works fine. However, when I take a look at NGROK terminal I see that PayPal is actually sending datas to my auto-return page first and THEN after something like 3 seconds sending the rest to my IPN file.</p>
  
  <p>I did think that the right data processing was IPN then SUCCESS... Am I wrong? Is that because I'm using NGROK or localhost? Or maybe PayPal Sandbox?</p>