It sounds like the ask is for prospective Guest WiFi users to be able to request Internet access using a method similar to https://documentation.meraki.com/MR/Encryption_and_Authentication/Sponsored_Guest but using Slack as the conduit, rather than email. This isn't possible natively, right now (in fact, this is the first time I've heard this ask). I guess it might be possible to do something via the API and some back-end tooling. The best bet would probably be to talk to an Ecosystem partner - someone like SpashAccess around this.
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