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QuickBooks will automatically match your transactions once it detects entries with similar amounts and details. This links them together, so you don't get duplicates.
If you haven't recorded a sales entry, manually input it in your company to match it with your banking transaction. Refer to this guide to learn more about managing your downloaded data and matching them to the ones in QuickBooks: Match online bank transactions in QuickBooks Online.
Furthermore, utilize these resources to learn more about classifying your bank data and balancing your account:
Keep in touch if you have other banking or sales-related concerns or questions. We'll get back to help you the best that we can.