There is a Slack integration via Webhooks, and it can be used for alerts, but it does not look like there is any way to pass wifi user access alerts via that webhook, only via email.
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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