I believe you're correct - in the above links, they are using Zapier to do the translation from Meraki webhook payload, to webex teams friendly payload. Zapier is rather straightforward, and though I've not played with it in a year or two, I believe they have a free tier. Your other option is to host an app yourself, and do that message translation. To that end, for testing webhooks on your laptop, look at ngrok- it creates an http(s) tunnel to your laptop, giving you a public URL. Also lets you replay webhook payloads, amazing for testing!
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