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docs/api/routes/v1/customergroup.md

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+# `GET /v1/customergroup`
+
+Protected. Requires a valid session cookie (`credentials: 'include'`).
+
+JTL-POS customer group synchronization
+
+Returns customer groups modified after lastChangedCustomerGroup cursor for the authenticated POS register, excluding 'Lieferanten'.
+
+## Query parameters
+
+| Param | Required | Type | Description |
+|-------|----------|------|-------------|
+| `lastChangedCustomerGroup` | no | string | Unix timestamp cursor of last customer group sync |
+| `limit` | no | integer | Maximum number of customer groups to return |
+
+## Response `200`
+
+Array of customer group objects for JTL-POS
+
+```json
+[
+  {
+    "customerGroupId": "1",
+    "name": "Endkunden",
+    "standard": "1",
+    "discountPercent": "0.000000",
+    "lastChanged": "1721000000"
+  }
+]
+```
+
+## Errors
+
+| Status | Description |
+|--------|-------------|
+| 401 | Unauthorized |
+
+---
+
+_Generated from `@openapi` JSDoc. Do not edit by hand — run `npm run docs:api`._