How to submit a feed using the JSON_LISTINGS_FEED to patch merchant_shipping_group attribute

[Daniell-Green]

I'm trying to update the merchant_shipping_group attribute using the JSON_LISTINGS_FEED. However, I'm unsure of the correct structure and process to submit this feed.

Could someone provide an example of a properly formatted feed for this purpose? Additionally, are there any specific requirements or limitations when patching merchant_shipping_group using this method?

I have tried the following:

        payload = {
            "header": {
                "sellerId": seller_id,
                "version": "2.0",
                "issueLocale": "en_US"
            },
            "messages": [
            ]
        }

        i = 0
        for row in df.itertuples():
            i += 1
            message = {
                "messageId": i,
                "sku": row.sku,
                "operationType": "PATCH",
                "productType": "PRODUCT",
                "patches": [
                    {
                        "op": "replace",
                        "path": "/attributes/merchant_shipping_group",
                        "value": [
                            {
                                "value": row.merchant_shipping_group_name,
                                "marketplace_id": Marketplaces.DE.marketplace_id
                            }
                        ]
                    },
                ]
            }
            payload['messages'].append(message)
            
            response = Feeds(
                    credentials=self.credentials,
                    marketplace=self.marketplace
            ).submit_feed(
                    feed_type="JSON_LISTINGS_FEED",
                    file=feed,
                    content_type="application/json; charset=utf-8"
            )

Sadly, I get an error. And even searching on the web I have not been able to find a working example.

Any guidance or examples even would be greatly appreciated!