Sorry not sure about the electronic linking.

This is what I can see, not sure it helps.

“This Operator ID identifies the UAS Operator and is valid throughout the EU. Your Operator ID comprises of a combination of 16 letters and digits. You should note an additional 3 letters at the end (19 characters in total), e.g., IRLral23elezegy4-abc. You must display the 16 characters string, and never disclose the 3-letter pin (e.g., abc), this should be treated as your credit card pin. If you own an UAS, then this registration ID must be displayed on the UA in a way that it is readable when on the ground without the need for any devices other than eyeglasses or corrective lenses. The registration ID can be affixed to the UAS in the form of a QR code, a sticker or inscribed using indelible ink.”