Update a customer group

import { createAdminClient } from '@spree/admin-sdk'

const client = createAdminClient({
  baseUrl: 'https://your-store.com',
  secretKey: 'sk_xxx',
})

// `customer_ids` is a full-set update — the model reconciles the membership
// to match the array (adds new IDs, removes ones not present).
const group = await client.customerGroups.update('cg_UkLWZg9DAJ', {
  name: 'VIP customers (Q1)',
  customer_ids: ['cus_UkLWZg9DAJ'],
})

spree api patch /customer_groups/{id} -d '{"name":"VIP customers (Q1)","customer_ids":["cus_UkLWZg9DAJ"]}'

{
  "id": "cg_UkLWZg9DAJ",
  "name": "VIP customers (Q1)",
  "description": "Top spenders",
  "customers_count": 0,
  "created_at": "2026-07-26T14:24:22.819Z",
  "updated_at": "2026-07-26T14:24:23.098Z"
}

{
  "error": {
    "code": "validation_error",
    "message": "Name can't be blank",
    "details": {
      "name": [
        "can't be blank"
      ]
    }
  }
}