Once the playback starts, upon utterance of "Alexa, Stop", which directive is expected to be received (and format)? Similar question for "Alexa, pause" "Alexa, resume" "Alexa previous" Alexa next".
These are all covered as standard built-in intents. Asking Alexa to stop will send AMAZON.StopIntent.
See the docs for more info: https://developer.amazon.com/docs/custom-skills/standard-built-in-intents.html
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