Whenever the customer updates the newsletter preference, event will be passed to klaviyo to update.
Reference: https://developers.klaviyo.com/en/reference/subscribe
Choose the preferred Opt-in option in Klaviyo Newsletter List Setting
![](https://www.huntbee.com/resources/wp-content/uploads/2022/09/image-30.png)
Whenever the customer updates the newsletter preference, event will be passed to klaviyo to update.
Reference: https://developers.klaviyo.com/en/reference/subscribe
Choose the preferred Opt-in option in Klaviyo Newsletter List Setting