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Workday RaaS returns data in Postman but not from ServiceNow (Date/Time query parameter issue)

WilliedH
Kilo Contributor

‎01-23-2026 02:00 PM

Hi Community,

 

We are integrating ServiceNow → Workday Report-as-a-Service (RaaS) and are seeing inconsistent behavior between Postman and ServiceNow when passing a Date/Time query parameter.

 

What’s happening:

  • The same RaaS endpoint, credentials, and parameters return data when called from Postman

  • The call from ServiceNow succeeds (HTTP 200) but returns no rows

  • No errors are returned by Workday

ServiceNow configuration:

  • Using REST Message / RESTMessageV2

  • Base URL contains only the RaaS endpoint (no query parameters hard-coded)

  • Query parameters are added via ServiceNow (not URL concatenation)

  • Date/Time parameter passed raw in ISO 8601 format (letting ServiceNow handle encoding)
    Example:
    2025-12-24T00:00:00-05:00

  • format=json passed as a query parameter

  • Authentication: Basic Auth (same credentials used successfully in Postman)

  • No custom headers beyond Authorization

Postman configuration:

  • Same endpoint, credentials, and parameter names

  • Same Date/Time value

  • Returns expected data

What we’ve validated so far:

  • Prompt name matches the Workday Web Service parameter name

  • The report runs successfully in the Workday UI

  • The integration user has access to the report

  • No double-encoding of parameters

  • Older dates (far in the past) still return no rows in ServiceNow

  • Date-only values do not error but also return no data

Question:


Has anyone experienced ServiceNow modifying, dropping, or mis-encoding query parameters (especially Date/Time values) when using RESTMessageV2, causing Workday RaaS prompts to be ignored or evaluated incorrectly?

 

Additionally, is REST Message / RESTMessageV2 the recommended and expected approach in ServiceNow for calling external endpoints like Workday RaaS, or are there alternative outbound methods that handle Date/Time query parameters differently?

 

Any guidance or examples would be greatly appreciated.

 

Thank you!

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chaithu1489
Kilo Sage

‎01-25-2026 11:48 PM

If you've configured the API as-is, there shouldn't be any issues since ServiceNow acts as the client. The only potential problem could be server-side restrictions limiting access

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