Hello @pkskypointcloud 

You should be able to get all of the List and Segment IDs using this URL:

https://a.klaviyo.com/api/v1/lists?api_key=****

Then, using a Segment ID, you can get the members of that segment with this URL:

https://a.klaviyo.com/api/v2/group/SEGMENT_ID/members/all?api_key=***

Make sure to replace the SEGMENT_ID and use the Klaviyo private API key in the requests.

Hey @jallain , the API https://a.klaviyo.com/api/v1/lists?api_key=**** is only returning us the Lists. Do we need to do some configuration to have it return segments too?

UPDATE: We are using v2 of the API. I guess it does not return segments yet. Is it recommended to use v1 in prod since the page mentions i’s DEPRECATED and asks to use v2?

@pkskypointcloud  For now you should be fine to use the V1 API for that request to get Segment IDs. I would keep using V2 everywhere that you can for other requests.

this api not responding properly

https://a.klaviyo.com/api/v2/group/SEGMENT_ID/members/all?api_key=***

I am passing List_ID and api_key properly when call
it is giving below response when called:=
{"message":"An internal API server error occurred. Please contact support@klaviyo.com."}

@roslyn This call works fine for me. Are you still getting that error? Double-check that the API key and List ID are correct and from the same account.