I hear your sentiments, 102BooksQ. I'll ensure you can remove the pay button when emailing customer invoices.

If you're not collecting online payments, you can remove the option for customers to pay online and update your online delivery options. This way, the pay button will not appear when sending customer invoices. Let me guide you on how.

1. Go to the Gear icon.
2. Choose Account and Settings, then select the Sales tab.
3. Under the Invoice Payments section, uncheck the payments options checkbox.
4. Click on Save and Done.

After that, change the email options for invoices:

1. Go back to the Gear icon.
2. Navigate to Account and Settings.
3. Click the Sales tab.
4. Head to the Online delivery section.
5. Choose HTML from the Additional email options for invoices dropdown.
6. Then hit Save and Done.

Finally, when you're ready to record customer payments, you might want to review this material as your guide: Record invoice payments in QuickBooks Online.

Feel free to update us in the thread if you have additional questions when managing your invoices or other related concerns in QuickBooks Online. I'm always here to lend a hand.