Parameter	Mandatory	Description	Examples	More Info
API	Yes	The API area	purchases.json
General	Yes	Parameters described in overview	see overview	Structure of an API call
Action	Yes	The action to perform	action=changesupplier
Identifier	Yes	Purchase ID or UUID	purchase=10008229
Supplier	Yes	Supplier Code	&supplier=1/aaaa

Example request:

http://<SERVER>/jsonapi/purchases.json?user=user&password=user&version=4&action=changesupplier&supplier=1/aaaa&purchase=10007388

Example response:

{
  "responsecode": 1,
  "responsestatus": "OK",
  "errorcode": 0,
  "errormessage": "",
  "responsemessage": "Purchase order supplier changed. ",
  "warningmessage": "",
  "success": true,
  "data": [
    {
      "poSupplierCode": "1/aaaa",
      "poSupplierContactInternalRef": 0,
      "poInternal": 10007388,
      "poUuid": "7A54C829DD0D174CA43A43B948386413",
      "poTimeStampModified": 1521037172,
      "poRecordVersionNumber": 25,
      "poPONumber": "{EST}"
    }
  ]
}