> For the complete documentation index, see [llms.txt](https://docs.commercelayer.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.commercelayer.io/core-api-reference/customer_subscriptions.md).

# Customer subscriptions

Customer subscriptions are simple resources that you can use to track newsletter registrations. Populate the reference with any key that makes sense to your business domain. Send the subscriptions to any third party tool or CRM for marketing and segmentation. Let the customers manage their active subscriptions through their reserved area.


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