For webhooks, you need to connect Mumara with your zapier account. It currently supports the hooks when a contact is added to Mumara. The documentation isn't yet live for hooks as we are in the phase of further development before we'll be officially launching it.
Zapier link to Mumara: https://zapier.com/developer/public-invite/115671/fe863bd7de78bc2dd6b34ff6945aec5b/