# Callback Policies

The following applies to all types of callbacks:

-   **Your Server:**  You'll need a server that's ready to support real-time events.
-   **Downtime / Timeouts:**  We make three attempts to deliver callbacks to your server. If all attempts fail, your endpoint will be  **blacklisted for 15 minutes**. During blacklistings, the callbacks will not be sent or attempted until the full time has elapsed.
-   **Response Codes:**  Our service deems a request successful if your server responds  **_200_**-**_302_**.
-   **Redirects:**  Callbacks can be a redirect URL, but  **cannot have any store**  (App Store, Google Play Store, Amazon Appstore for Android, etc.) as a final destination. They must also be valid URLs. (For the best reliability, do not use redirects.)
-   **SSL:**  The endpoint must support SSL.
-   **URL Encoding:**  All data is URL-encoded before being sent.