Added support for previewing and uploading generated discount codes

You can now preview your generated Discount Codes in the Merchant Center. With this enhancement, you can also upload the generated Discount Codes directly to your Project. In addition, you can now link Cart Discounts to Discount Codes while generating your Discount Codes.

Previously, you had to download the generated Discount Codes without a preview option and then upload them to your Project. With this enhancement, it is possible for you to review your generated Discount Codes directly in the Merchant Center and upload the Discount Codes to your Project without having to download them first.