Every new lead you generate with a Gather Opt-in campaign assigns the lead a unique hashed ID which is synced along with other properties to your Klaviyo account.
You can use this custom property in an email button to log the lead back into the campaign without the need to pass their name and email through the URL.
Using the property in a liquid variable, instead of the name and email, enhances the lead’s data privacy by obfuscating personal information. By replacing the name and email with a hash, the individual's identity is better protected.
You can use this feature in 2 ways, to automatically login in the lead, removing the requirement to re-enter their name and email address, or you can prefill their name and email address in the log-in form.
To detailed instructions on how to use this new feature, check out the following article in the Gather Academy.