curl --request GET \
  --url https://api.zenskar.com/customers/{customer_id} \
  --header 'organisation: <api-key>' \
  --header 'x-api-key: <api-key>'

{
  "id": "123e4567-e89b-12d3-a456-426614174000",
  "customer_name": "Acme Corporation",
  "email": "billing@acme.com",
  "phone": "+1-555-0100",
  "billing_address": {
    "street": "123 Business Ave",
    "city": "San Francisco",
    "state": "CA",
    "postal_code": "94102",
    "country": "US"
  },
  "custom_data": {
    "industry": "Technology",
    "company_size": "50-200"
  },
  "created_at": "2023-01-01T00:00:00",
  "updated_at": "2023-06-15T10:30:00"
}