How do I link my whatsapp to my Quickbooks app? There is an option to send invoices via whatsapp, but gives an error when I try it?

It's nice to have you here on the QuickBooks Support page, Mellissa.

I want to share some insights about sending invoices via WhatsApp. Can you share the exact error message you're getting when trying to send invoices? It will help me check for ongoing issues being worked on by our developers.

Also, please note that this feature is currently only available for Android devices only, not IOS. There are also two ways to send your invoices, on the PC where WhatsApp is installed or from the QBO Mobile app.

Please see the steps on how to do it both ways: Send invoices with WhatsApp

As an alternative, you can choose other options to send your invoice. See the details here: Create and send invoices in QuickBooks Online

Please post here again with the additional details. I'll be right here to help you send your invoices successfully. Have a wonderful day!