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HeyGen sets October 31 retirement for older template field names

HeyGen’s October API changelog says older template character fields `avatar_look_id`, `character_id` and `character_type`, plus the older `scenes` response field, will be removed on October 31, 2026. Developers should use `avatar_id` and `composition.scenes`; `scene_ids` is unaffected. The changelog supplies only the month of this notice, so its original publication day is unknown.

HeyGen

HeyGen Template API field retirement

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