curl --request PATCH \
  --url http://api.salesjourney.io/sale_order/{saleOrderIdentifier} \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "customFields": {
    "4461f869-1b49-4d89-f3fe-f4d5e5c40607": "12852"
  }
}
'

{
  "success": true,
  "message": "<string>"
}