GET
    /productunits
  
  curl \
 --request GET 'https://rest.api.24sevenoffice.com/v1/productunits' \
 --header "Authorization: string"
        Response examples (200)
  
  [
  {
    "id": 1,
    "name": "Litre",
    "symbol": "l"
  },
  {
    "id": 2,
    "name": "Metre",
    "symbol": "m"
  },
  {
    "id": 3,
    "name": "Kilometre",
    "symbol": "km"
  }
]