Generate an HMAC key

Returns an [HMAC key](https://en.wikipedia.org/wiki/HMAC) for the webhook identified in the path. This key allows you to check the integrity and the origin of the notifications you receive.By creating an HMAC key, you start receiving [HMAC-signed notifications](https://docs.adyen.com/development-resources/webhooks/verify-hmac-signatures#enable-hmac-signatures) from Adyen. Find out more about how to [verify HMAC signatures](https://docs.adyen.com/development-resources/webhooks/verify-hmac-sign...