This is pretty near:

Detect breaches with Canary credit cards!

TL;DR;

Today we’re releasing a new Canarytoken type: actual credit cards!

1. Head over to canarytokens.org;
2. We give you a valid credit card (number, expiration, and CVC);
3. If anyone ever attempts to use that card you’ll be notified.

https://blog.thinkst.com/2023/01/swipe-right-on-our-new-credit-card-tokens.html

Swipe right on our new credit card tokens!

Thinkst Thoughts
@lojikil brilliant, thanks for sharing. Will start the week looking at how to get some of these into our production and dev environments. Also maybe 1Password and some iCloud excel as suggested.