I thought of this from the eye camera thread. I think it's pretty themely that people have these memory modules that carry important IC data that could be stolen/extracted.
*** Further suggestion - Deckers can encode this data on the memory chip, and then you will need another Decker to decode the memory chip to see the juicy information stored on it. SICIDs, corporate keys, phone numbers, anything you can think of! ***
One difference from e-notes would be that you obviously wouldn't be able to fit entire paragraphs of information in this memory chip, so it'd be more short and concise than using an e-note (and riskier).
Example usage -- pay someone to transfer the encoded datachip containing valuable corporate paydata to your Syndicate contact. It could get intercepted and extracted, you could get killed...
Think the new Cyberpunk 2077 cinematic trailer with the chip.
Data runners unite!