configurationThe configuration interface to be used
requestIdA unique identifier that can be used to track the request
textToSpeakThe text to be spoken by the request
ttsDataThe text parameters used for the request
audioFileTypeThe expected audio file type of the request
audioStreamWhether the audio should be played while streaming or should wait until completion.
useEventsWhether or not events should be requested with this audio request
onDownloadProgressThe callback for progress related to downloading
onFirstResponseThe callback for the first response of data from a request