You need to migrate the list calls api from v2 to v3. There are multiple changes that is done in v3, from pagination to now fetching the call transcript for each call using get-call. If you need any help in it, feel free to dm me.
No changes in the webhook.
Don’t worry, this notice just means you need to make a quick update to your code backend to prevent any service interruptions. Retell recently deprecated its legacy list endpoints to switch to a more unified pagination format. To resolve this, your development team needs to change the API endpoint URL path in your application code from POST /v2/list-calls to the new POST /v3/list-calls endpoint. Additionally, because the new v3 version uses a unified pagination pattern, the code handling the API response must be updated to read data from the nested items field array inside the response object rather than expecting the top-level raw array returned by the legacy endpoint. You can share the official migration guide directly with your developers here: Legacy list endpoints removed for v2/v3 (06/15/2026) - Retell AI . It’s a very quick endpoint shift that will keep your system running perfectly!