Please be aware that you will need to at least be on eBay's Starter plan in order for you to use any integrations, including Trunk, with your eBay store. More information on this can be found here

If you're having trouble adding an eBay sales channel to Trunk or your store isn't showing after authorizing, it's most likely because you aren't subscribed. Once you're subscribed, you should be able to add your eBay store as a sales channel!

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