> ## Documentation Index
> Fetch the complete documentation index at: https://voucherify-pw-further-tests.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# List Customer's Segments

> Returns the list of segments IDs to which the customer belongs to.  

If you pass a `customerId` which is not stored and recognized by Voucherify as an existing customer in the system, the response will generate a list of segments that the customer would potentialy qualify for if they were to become a customer tracked in the system.