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I don't see why not? Did you run into some issues while trying to use those features without Lambda?
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Alexa Push Notifications Error on Server, working on local
[SOLVED] Get all reminders for my skill
TOO_MANY_REQUESTS error with Proactive Events API. PLEASE document the limits and help!
Reminder API from Lambda without invocation from the Alexa skill
error status code: 401 for creating a reminder