Hello there, @ReviveGardens,

Let me clarify some information about the pay link not showing when sending invoices in QuickBooks Online (QBO). If you want to review the invoice and see the link, you might be referring to the Save and share link option. Clicking Save and send only lets you view the invoice and gives your customers the Print or save on their end.

Here is the virtual reference of their differences:

Save and send 



Save and share link



If you want your customers to have the Review and pay option, you may need to turn on the QuickBooks Payment feature. 

Here's how: 

1. On your QBO account, go to the Gear icon and select Account and Settings.
2. Go to the Payments tab.
3. Click Learn more in the QuickBooks Payment section. 
4. Select Set up Payments.

For detailed information, kindly visit: Sign up for QuickBooks Payments.

In addition, make sure to choose the Online invoice email option on the Online delivery settings. Here's how:

1. In the Account and Settings page, go to the Sales tab.
2. Then locate the Online delivery section.
3. On the dropdown, select Online invoice.



4. Once ready, click Save.

I'll also add this article you can read if you want to personalize and add specific info to your sales forms in QBO: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Let us know if you require further assistance with sending invoices in QBO. The Community team always has your back. Keep safe!