title: What is a "platform token" in SNS and/or APNS?
body: <p>I get from Amazon SNS that my platform token is invalid. What is a platform token? Apple has a "device token", SNS has "endpoints" with tokens, along with "Applications" and "Application endpoints", but nowhere the word platform or "platform token".</p>
  
  <p>Platform would indicate a broader error, but "platform token" would seem to refer directly to the token given by the device and connected to an endpoint.</p>
  
  <p>I'm not asking how to fix, just what these words mean and where I might find them used elsewhere (if they are used elsewhere) ie. in Amazon docs.</p>
  
  <blockquote>
    <p>{"DeliveryAttempts":1,"EndpointArn":"arn:aws:sns:us-east-1:66511747:endpoint/APNS_SANDBOX/aaaaaaa/a4772ef2-b986-2e63-9642-644802a9f931","EventType":"DeliveryFailure","FailureMessage":"Platform
    token associated with the endpoint is not
    valid","FailureType":"InvalidPlatformToken","MessageId":"9046f641-91fe-5fc4-81e5-b94bd547b7ca","Resource":"arn:aws:sns:us-east-1:66511747:app/APNS_SANDBOX/aaaaaaa","Service":"SNS","Time":"2016-01-08T23:12:57.692Z"}</p>
  </blockquote>