I think a way to verify that they have Glass would be a great idea. This was requested on the list of issues .
At the same time, you can implement a โdouble optionโ. It is believed that it is recommended to send a "welcome" card - you can expand this greeting card to let them know that it confirms this card. It can be a fairly simple operation, and it is not burdensome either for them or for you. If they do not pass within a reasonable period of time (or after some reminders ... or something else), you can possibly turn off your actions in Glass.
Actually ... the more I think about it, the more I like this idea, even when the API quota limits are removed ...
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