# External ID for customer groups

#### What's new

New field for syncing customer groups with external services. 

#### Changes in API

New `externalReferenceId` field available for <mark style="color:green;">`GET`</mark> `/customer_groups` and <mark style="color:green;">`GET`</mark> <mark style="color:purple;">`PUT`</mark> <mark style="color:blue;">`POST`</mark> `/customer_groups/{groupId}` API requests allows safe sync of customer groups from external services. For now, it is only used for internal integrations inside Lightspeed.

#### Documentation links

{% content-ref url="/spaces/G9n5VxMY9T0Ob3D56PSD/pages/Ob762Vi9PDfTNlYTmuUR" %}
[Customer groups](/api-reference/rest-api/customers/customer-groups.md)
{% endcontent-ref %}


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