https://techcrunch.com/2019/09/26/alexa-developers-can-now-personalize-their-skills-by-recognizing-the-users-voice/

Amazon Alexa is already capable of identifying different voices to give personalized responses to different users in the household, thanks to the added support for voice profiles two years ago. Now, those same personalization capabilities will be offered to Alexa Skill developers, Amazon has announced.

Alongside Amazon’s big rollout of new consumer devices on Wednesday, the company also introduced a new “skill personalization” feature for the Alexa Skills Kit, that lets developers tap into the voice profiles that customers create through the Alexa companion app or from their device.