A call reference generated by the caller and unique to the caller to provide correlation between the caller and system with a maximum length of 255

The timestamp, expressed in Epoch timestamp using millisecond precision, when this event was published.

The signature to verify the authenticity of this request. This is the base64 hash (HmacSHA256) of the published-timestamp using your API key.

The signature to verify the authenticity of this request. This is the base64 hash (HmacSHA256) of the call-ref + payload + published-timestamp using your API key.

A unique call reference included in every call, that enables the receiver to avoid duplicate handling of a webhook request (e.g. webhook was resent).