An HTTP or HTTPS URL to which callback notifications are to be sent. To be allowlisted, the URL must
successfully echo the challenge string during URL verification. During verification, the client can also check
the signature that the service sends in the X-Callback-Signature
header to verify the origin of the request.
A user-specified string that the service uses to generate the HMAC-SHA1 signature that it sends via the
X-Callback-Signature
header. The service includes the header during URL verification and with every
notification sent to the callback URL. It calculates the signature over the payload of the notification. If you
omit the parameter, the service does not send the header.
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Parameters for the
registerCallback
operation.