The Meraki Dashboard API v1 lives at https://api.meraki.com/api/v1 and manages Meraki networks and devices.
Enable API access under Organization → Settings in the Meraki dashboard, then generate a key in your profile. Send it as Authorization: Bearer <key>. In the examples it's written {{MERAKI_API_KEY}}.
Full reference: https://developer.cisco.com/meraki/api-v1/
curl https://api.meraki.com/api/v1/organizations \
-H "Authorization: Bearer {{MERAKI_API_KEY}}"
curl https://api.meraki.com/api/v1/organizations/{{ORG_ID}}/networks \
-H "Authorization: Bearer {{MERAKI_API_KEY}}"
curl https://api.meraki.com/api/v1/organizations/{{ORG_ID}}/devices \
-H "Authorization: Bearer {{MERAKI_API_KEY}}"