A guide to generating UUIDs with Sendlane
VAR_FIRST_NAME pulls in the recipient's first name
VAR_LAST_NAME pulls in the recipient's last name
VAR_CAMPAIGN_ID pulls in the campaign's unique ID
By combining these tags, we can successfully create dynamic UUIDs and our "key" parameter values would therefore look something like this:
NOTE: the same tags should be passed into the "key" parameter values of both the click and image URLs just like we've done above.