Chat onboarding

Changes to Create Chat Identity Token

post/chat/onboarding/identity-token

Sep 9, 2026d33602392507 Revision changes
- info
  added the new optional request property
- info
  the request property became optional
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  request property list-of-types was widened by adding types null to media type application/json
- info
  the request property's minLength was decreased from 1 to 0