If you have an Android phone, ensure the NFC feature is activated. For iPhones, NFC is activated by default.

Press your OPUS card against the upper part of your mobile phone. (The detection area’s location depends on the phone model and might be located on the front or back). It will vibrate once it connects. Now, hold your OPUS card still for a few seconds so the app can recognize it.  You can click on the following link for a visual, step-by-step guide: https://www.artm.quebec/en/chrono-blog/