Any additional custom key/value pairs to forward to the iframe payload.
OptionalanimationAnimation can be a simple name string or an object with a name
OptionalexpressionExpression can be a simple name string or an object with a name/intensity
The text for the avatar to speak.
OptionalvoiceVoice can be a simple id string or an object with an id
Object payload for the
speak({ text, ... })command form. Supports known fields and allows arbitrary additional properties such asbackgroundUrl,sceneId, etc.