Dropbox Sign API callback retries

If your callback URL is not reachable or returns a non-successful response, we will retry POSTing the event up to 6 times, with each retry interval being exponentially longer than the previous one. If the sixth retry fails, we will clear your callback URL and you must enter a new one to receive future callback events.

Please note that our requests will timeout after 30 seconds, so callbacks will fail if your server takes longer than that to respond. The retry pattern is described below, an alert email will be sent to you after POSTing has failed several times.