The devnet sandbox is a good place to start. When you open the sandbox, you should see a username and password that you can use to login to Meraki Dashboard at meraki.cisco.com. You will also see an API key that you can use with the dashboard APIs. Once you login to Meraki Dashboard (using the credentials from the Sandbox page), go to Help > API docs. https://create.meraki.io/ is also a great resource for getting started.
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