A guide to generating UUIDs with Sendlane
VAR_FIRST_NAME pulls in the current day
VAR_LAST_NAME pulls in the current month
VAR_SIGNUP_IP pulls in the recipients email address
By combining these tags we can successfully create a dynamic UUID and our key parameter would therefore look something like this:
Custom fields could also be created and added to the default personalization tags above to ensure each key value is unique.
NOTE: the same UUID must always be passed into the key parameter of both the anchor and image tag