Profile: Support

Google creates the badge itself.
You can change CSS styles in this file BadgeCode.cshtml

Я думаю что этот класс и метод были изменены
PictureService.UpdatePicture
Это плохо, плагин не сможет получить фотографию.

1. Попробуйте сделать фид для Яндекса, я делал выгрузку в пром с помощью него.

2. Можете как-то обновить ядро магазина до версии 4.30 или на крайняк до 3.90?

Какая версия nopcommerce?
Вы используете оригинальные или касомные DLL файлы nopcommerce?

You can use your Sku for this field.
Don't forget to configure these values in the eBay products.

Thank you.
I fixed this bug.

Download the new release of the plugin. I have fixed this issue.

I means that you have the one country for shipping address (you will send the parcel from this country)  and one DHL account for for all shipping addresses.
Am I right?

Check you use the live or sandbox DHL API.
Write to your DHL assistant and send this API request and API response.
Write to me about the result.

Open the plugin folder.Change the file logo.jpg

You added the column discountprice in the feed file.
Facebook doesn't have such column in official documentation.

https://developers.facebook.com/docs/marketing-api/catalog/reference/#da-commerce

You need to write to Facebook support that they have to add this column  discountprice  in the official feed.