Encoding special characters

If you are updating records via the API with text that has special characters like ampersands embedded in the text, you must first encode these.

see :
https://www.w3schools.com/tags/ref_urlencode.asp

e.g.

To update the client name to "New Company & Co",
this needs to be passed to the api as "New Company %26 Co"

Example request (OAuth 2.0):

http://<SERVER>/jsonapi/clients.json?version=6&action=update&input={
Authorization: Bearer <access_token>
  "data": [
    {
      "clientCode": "1/P0909",
      "clientName": "New Company %26 Co"
    }
  ]
}

Example request (legacy username/password):

http://<SERVER>/jsonapi/clients.json?version=6&action=update&input={
  "data": [
    {
      "clientCode": "1/P0909",
      "clientName": "New Company %26 Co"
    }
  ]
}&user=<username>&password=<password>