How do we stop ebay connector adding every transaction as a new customer? The customer base is massive and unmanageable now?

Yes, there is, @jmw-books. You can choose the Generic Online Sale Customer option from your eBay account, which allows you to use a single generic customer record for all your sales.

If you need more detailed guidance on this process, please contact Onesaas Support for assistance.

Once this is set up, all future sales will be recorded in QuickBooks under this generic customer record. You can find more details in this article: Connect eBay to QuickBooks Online.

If you have any further questions, please feel free to revisit this thread.