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You can find the URL and SystemKey required in the call by clicking API Keys (key icon) at the top-right of the Registry Details page.
The token required in the call can be found on the Registry Details page or a JWT generated ClearBlade-UserToken value can be set to a JWT (note the claims required for HTTP calls).
NOTE applicable only for http://iot.clearblade.com users:
The ClearBlade-UserToken value can also be set to the token found by clicking the API keys icon at the top-right of the Registry Details page. Using the JWT is recommended since it is device-specific.
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