API
Keys authorize the JSON API. Proxy usernames authorize the gateway. They are not interchangeable.
https://proxyonly.com/api/v1
Create a key in the dashboard. The secret is shown once and stored only as a hash.
Authorization: Bearer po_test_...
locations:read, proxies:read, proxies:write, usage:read. A key without the permission receives 403.
60 requests a minute per key. A 429 response means you should back off.