Hi @Garden Maintenance,

Although there isn't an automated process to send these receipts to let your customers know their invoices are paid, you can accomplish this by hand.

Here's how:

1. Highlight the Sales tab, then select All Sales.
2. On the Filter drop-down menu, click it.
3. Select Money received under the Type drop-down menu, then tap Apply.
4. Locate the Payment transactions that you want to send to your customers, then click any 1 of them. 
5. Hit the Print menu. On the Print preview screen, download the PDF copy of the receipt. You can do this on multiple receipts so you can attach the PDF files to your own email and send it to the appropriate client. 

You can follow the workaround I provided above until a different feature becomes available for you. Speaking of which, if you want to keep tabs with updates that are recently added to QuickBooks Online, feel free to visit The QuickBooks Blog page.

 Any other questions? Drop them in the comments below, and I'll get back to you as soon as I can.