Finding the Hidden ID of a Charge Card
The Hidden ID (also called UID or token ID) is the internal identifier stored on a charge card’s RFID chip. It is required when creating a Local Token in Eve Control. Unlike the Visual ID printed on the card, the Hidden ID is not directly visible. Below are several methods to find it.
Option A: Swipe the Card on a Charging Station and Read the Logs
This is the most convenient method if the charger is already connected to Eve Control. The charger sends an Authorize request containing the card’s Hidden ID whenever a card is swiped — even if the card is not yet registered.
1 Swipe the RFID Card
Go to the charging station and swipe (or hold) the RFID card on the card reader. The charger will send an Authorize request to Eve Control. It does not matter whether the authorization succeeds or fails — the card’s identifier is included in the request either way.
2 Open the Charging Station in Eve Control
Navigate to Charging Stations in the sidebar and click on the charger where you swiped the card.
The charging station’s Overview page
3 Go to the Logging Tab and Find the idTag
Click the Logging tab. Look for an Authorize request in the log entries. The idTag field in this message is the card’s Hidden ID. Copy this value and use it when creating the Local Token.
The Logging tab showing an Authorize request — the idTag value is the card’s Hidden ID
Tip: The authorization result will show “Invalid” if the card is not yet registered — this is expected.
The idTag value is still visible in the request regardless of the authorization result.
Option B: Check the Card’s Packaging or Documentation
Some charge card suppliers print the UID on the card’s packaging, on an accompanying sticker, or in the delivery documentation. Check any materials that came with the card.
Option C: Use a USB NFC/RFID Reader
A dedicated and compatible USB NFC/RFID reader (e.g. an ACR122U) connected to a computer can read the card’s UID. This is useful when registering many cards in bulk, as the UID is typically output as text that can be copied directly.