The Auth0 Management API lives on your tenant's domain at https://<tenant>.auth0.com/api/v2 (or .us.auth0.com, .eu.auth0.com…).
Get a Management API token under Applications → APIs → Auth0 Management API → API Explorer for testing, or via client credentials for production. Send it as Authorization: Bearer <token>. In the examples it's written {{AUTH0_MGMT_TOKEN}}; {{AUTH0_DOMAIN}} is your tenant's domain.
Full reference: https://auth0.com/docs/api/management/v2
curl "https://{{AUTH0_DOMAIN}}/api/v2/users?per_page=10" \
-H "Authorization: Bearer {{AUTH0_MGMT_TOKEN}}"
curl "https://{{AUTH0_DOMAIN}}/api/v2/users-by-email?email=jenny%40example.com" \
-H "Authorization: Bearer {{AUTH0_MGMT_TOKEN}}"
curl "https://{{AUTH0_DOMAIN}}/api/v2/logs?per_page=10" \
-H "Authorization: Bearer {{AUTH0_MGMT_TOKEN}}"