McDo - What are the three most important things to keep in mind?
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Generating a file with your listing information and sending it to us should be a painless task. Ideally, the file should come as a direct export from your internal inventory management system. If it takes time for you to put this file together, then McDo loses its purpose.
Once a format is agreed upon, you will need to stick by this format for every future listing & product import—regardless of whether you are uploading a CSV file into the Back Office or pushing the data through FTP/API. Otherwise, the script will fail to read the data.
For the listing updates, you have the choice between using the exact same file format or just import a simple CSV with following column names: "sku", "price", "quantity".