Quickbooks API: How to generate purchase order against the orders placed by guest in quickbooks using api? - api

Question

I have developed eCommerce website with OpenCart framework where when customer places order purchase order should be created in QuickBooks.
I have referred this documentation https://developer.intuit.com/app/developer/qbo/docs/api/accounting/all-entities/purchaseorder
The api to create a purchase order accepts following json input
{
"PurchaseOrder": {
"DocNumber": "1005",
"SyncToken": "0",
"domain": "QBO",
"APAccountRef": {
"name": "Accounts Payable (A/P)",
"value": "33"
},
"CurrencyRef": {
"name": "United States Dollar",
"value": "USD"
},
"TxnDate": "2015-07-28",
"TotalAmt": 25.0,
"ShipAddr": {
"Line4": "Half Moon Bay, CA 94213",
"Line3": "65 Ocean Dr.",
"Id": "121",
"Line1": "Grace Pariente",
"Line2": "Cool Cars"
},
"VendorAddr": {
"Line4": "Middlefield, CA 94303",
"Line3": "42 Main St.",
"Id": "120",
"Line1": "Geoff Hicks",
"Line2": "Hicks Hardware"
},
"POStatus": "Open",
"sparse": false,
"VendorRef": {
"name": "Hicks Hardware",
"value": "41"
},
"Line": [
{
"DetailType": "ItemBasedExpenseLineDetail",
"Amount": 25.0,
"Id": "1",
"ItemBasedExpenseLineDetail": {
"ItemRef": {
"name": "Garden Supplies",
"value": "38"
},
"CustomerRef": {
"name": "Cool Cars",
"value": "3"
},
"Qty": 1,
"TaxCodeRef": {
"value": "NON"
},
"BillableStatus": "NotBillable",
"UnitPrice": 25
}
}
],
"CustomField": [
{
"DefinitionId": "1",
"Type": "StringType",
"Name": "Crew #"
},
{
"DefinitionId": "2",
"Type": "StringType",
"Name": "Sales Rep"
}
],
"Id": "257",
"MetaData": {
"CreateTime": "2015-07-28T16:01:47-07:00",
"LastUpdatedTime": "2015-07-28T16:01:47-07:00"
}
},
"time": "2015-07-28T16:04:49.874-07:00"
}
My website has a guest checkout so I need to know how to generate purchase order for guests as the above json format expects customer id to be sent. Since it is guest who is placing order I do not have customer id to pass for the api