Returns specific customer

Example response

{
  "data": {
    "id": 1,
    "first_line": "Craftboxx GmbH",
    "icon": "fa-user-tie",
    "custom_number": "C-1001",
    "name": "Craftboxx GmbH",
    "name_addon": "HQ",
    "customer_number": "C-1001",
    "info": "Important customer",
    "source": "manual"
  }
}