curl --request PATCH \
  --url https://api-m.sandbox.paypal.com/v2/checkout/orders/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
[
  {
    "op": "add",
    "path": "<string>",
    "value": "<unknown>",
    "from": "<string>"
  }
]
'

{
  "name": "INVALID_REQUEST",
  "message": "Request is not well-formed, syntactically incorrect, or violates schema.",
  "details": [
    {
      "issue": "FIELD_NOT_PATCHABLE",
      "field": "<string>",
      "value": "<string>",
      "location": "body",
      "description": "Field cannot be patched."
    }
  ],
  "debug_id": "<string>",
  "links": [
    {
      "href": "<string>",
      "rel": "<string>",
      "method": "GET"
    }
  ]
}