- Customizable: you can tell MailUp when to make that call, to which URL, and what parameters to include in the call
- Smart: if the receiving server does not respond successfully, MailUp will try again (it retries 5 times, every 5 minutes for a total of 25 minutesover a 25 hour period, see detailed in the information box below)
- Standardized: the way information is provided to the receiving end (the "Callback URL") follows certain standards that make it predictable. The Web page that receives the call (the "Callback URL") can be programmed in any programming language.
In case there is no successful handshake, the callback is repeated according to the following schedule:
Viewing existing Webhooks
To view webhooks that have already been setup set up on your account, select Settings > Advanced settings > Developer's Corner > Webhooks.
The system will display a list of webhooks for the different Lists in the account. Use the Actions menu to edit or remove a webhook, and click on Add new webhook to add a new one.
You can also view and edit list-specific webhooks, by selecting Settings > List settings > Preferences > Webhooks. Here you won't be able to view and edit all the webhooks that have been set up in the admin console, but only those related to the list you are currently in.