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Raise Exception in VendorInvoices().submit_invoices() when trying to submit a new invoice

See original GitHub issue

Describe the bug When trying to submit a new invoice to VendorInvoices().submit_invoices() for Retail Partners, I get an exception that json content is invalid. It seems that the key from kwargs is added to the beginning of JSON object, which it is not supposed to.

Error Message

raise exception(error, headers=res.headers)
sp_api.base.exceptions.SellingApiBadRequestException: [{'code': 'InvalidInput', 'message': 'Invoices', 'details': ''}, {'code': 'InvalidInput', 'message': "Invalid content was found starting with element 'body'. One of '{invoices}' is expected.", 'details': ''}]

To Reproduce

Here is the code used to call Amazon Vendor SP-API:

with open("invoice.json", ) as file:
      obj = json.load(file)
 
res = VendorInvoices(account="VC").submit_invoices(body=obj)

This is the invoice object that was created according to Amazon Vendor SP-API guidelines:

{
    "invoices": [
        {
            "billToParty": {
                "address": {
                    "addressLine1": "440 Terry Ave N",
                    "city": "Seattle",
                    "countryCode": "US",
                    "name": "Amazon.com",
                    "stateOrRegion": "WA"
                },
                "partyId": "AKC1"
            },
            "date": "xxxxxxxx",
            "id": "xxxxxxxx",
            "invoiceTotal": {
                "amount": xxxxxxx,
                "currencyCode": "USD"
            },
            "invoiceType": "Invoice",
            "items": [
                {
                    "amazonProductIdentifier": "xxxxxxx",
                    "invoicedQuantity": {
                        "amount": 10.0,
                        "unitOfMeasure": "Eaches"
                    },
                    "itemSequenceNumber": "9",
                    "netCost": {
                        "amount": "xxxxx",
                        "currencyCode": "USD"
                    },
                    "purchaseOrderNumber": "xxxxxxx",
                    "vendorProductIdentifier": "xxxxxxxx"
                }
            ],
            "paymentTerms": {
                "discountDueDays": xx,
                "discountPercent": "xx",
                "netDueDays": xx,
                "type": "Basic"
            },
            "remitToParty": {
                "address": {
                    "addressLine1": "xxxxxxxx",
                    "city": "xxxxxx",
                    "countryCode": "US",
                    "name": "xxxxxx",
                    "postalOrZipCode": "xxxxxx",
                    "stateOrRegion": "WA"
                },
                "partyId": "OR4YV"
            },
            "shipFromParty": {
                "address": {
                    "addressLine1": "xxxxx",
                    "city": "xxxxxx",
                    "countryCode": "US",
                    "name": "xxxxx",
                    "postalOrZipCode": "xxxxxx",
                    "stateOrRegion": "WA"
                },
                "partyId": "OR4YV"
            },
            "shipToParty": {
                "address": {
                    "addressLine1": "440 Terry Ave N",
                    "city": "Seattle",
                    "countryCode": "US",
                    "name": "Amazon.com",
                    "stateOrRegion": "WA"
                },
                "partyId": "AKC1"
            }
        }
    ]
}

Expected behavior

I expect this API call to return an ApiResponse with res.payload that includes transactionId. I can then use transactionId to check the request status later.

Desktop: