You should only have to upload discount codes if you need to run a lite version of integration. Speak to your CSM if you're unsure if this applies to you.

To upload discount codes, all you have to do is go to the 'Settings' tab on the left panel. Select 'Sales & Discounts' from the top panel. Click the "Download template" button located under the 'Discount codes' heading. Once downloaded, complete the document in the given format and save it as a CSV. Return to the admin, click the "Upload file button" and upload you CSV file. Finally, click the "Save" button on the top right to to save your changes. You're done ;)

See how here:
https://www.useloom.com/share/a880a4ed618f40caaeea012062f46268

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