Customer tags are a Shopify feature brands can use to build funnels triggered by customer-specific criteria. For example, if you want VIP customers to receive a certain post-purchase offer, or you would like returning customers to view a particular product, you can use customer tags to create these custom funnels. 

When adding a customer tag to your CartHook account, be aware that CartHook does not sync any customer tag information from your Shopify store. Instead, you are creating an identical tag in CartHook. This means the tag you enter into CartHook must match your Shopify customer tag exactly

We recommend copying the customer tag from your Shopify store and pasting it into CartHook’s customer tag field to ensure there are no differences. If you create a customer tag in CartHook that does not match a tag in your Shopify store, the funnel will not be triggered as expected or will never be triggered.

To learn more about creating funnels, please visit the following help article: Set Funnel Criteria.