Access card:
Public transport:
Scan your card with TagInfo so we can see what can be done
Credit card:
Get a payment conversion or walletmor
Login to websites:
Are you into tech? Do you think you can setup your own little auth server? If so, Spark 2 can do login with google with google business accounts, there’s a tutorial on the VK forum
Encrypted text:
Most chips can do that, Sparks cant but xNT xDF2 NExT xSIID etc can
Not making it “publicly visible” is a bit tricky, you can store it behind normal NDEF records but that doesnt mean noone can see it
Would the VivoKey Key Value Store be enough (store it on a server)?