Uses Phonecheck's Cloud DB API — a Station ID and an API key, no password. Create the key in your Phonecheck Cloud portal (Settings → API), then paste it here. Enable the ESN / SIM-lock / carrier-lock checks on your profile so blacklist & lock status come through with each device.
Any station username on your account — not your master cloud login.
The authentication API key created for clientapiv2.phonecheck.com.
Comma-separated to limit syncing to those stations only.