Hi Ripu,
Thanks for your question!
The “undefined: undefined” message may result from not selecting an environment in the filter dropdown. Please select “Data at the Point of Care Sandbox” as the filter in Postman and try making your request again.
Additionally, please ensure that the private_key, client_token, and key_id values are put in both the Initial Value column and the Current Value column, as in the example screenshot below.
Please let us know if you continue to experience any further issues.
Best,
The DPC Team