title: How to handle the status 21100-21199 returns while validating the iOS receipt
body: <p>Apple recently updated their iOS receipt validating service (<a href="https://developer.apple.com/news/?id=07182017a" rel="noreferrer">https://developer.apple.com/news/?id=07182017a</a>), which added the <code>21100-21199 Internal data access error</code>. But there's no more details on how to handle this error.</p>
  
  <p>Does anybody knows how to handle this while the client met this error?</p>