Hi @Kwei
Thank you for your question and for posting it in the community!
Depending on which platform you use to host your store (Shopify, Woocommerce, etc.) and the integration settings between that platform and Klaviyo, you can automatically add users to your list.
For example, if you are using Shopify, when you integrate Shopify with Klaviyo, one of the settings is to “Collect Email Subscribers” which will automatically add any contact that provides an email address via a Shopify form (account create, checkout started, purchase, etc.). When this is enabled, you can also designate a list with Klaviyo for where those contacts will be added.
If this is not enabled then those contacts would not automatically be added.
I would check the settings for the integration you have with your store as a first step to see if its available (Which I assume most of the integrations would provide this automated sync) and if not enabled, then configure it for your store.
I hope that helps!
@In the Inbox