Can I add a signature to my sales invoice?

Hi there, 

QuickBooks is a versatile program that enables you to send invoices to your customers with ease. I can see the benefit of being able to add an electronic using the QB mobile app. 

You'll have to do this on your mobile app and here's how: 

iOS

1. From the Menu ☰, select Estimates or Invoices.
2. Select an existing transaction, or create a new invoice.
3. Add any necessary information.
4. Select Save.
5. Select Get Signature.
6. Have your customer sign with their finger.
7. Select Done.

Android

1. From the Menu ☰, select Estimates or Invoices.
2. Select an existing transaction, or create a new invoice. 
3. Add any necessary information.
4. Select Done.
5. Select Get Signature.
6. Have your customer sign with their finger.
7. Select Done.

Give this a try and let me know if this info helps. I'll be one message away in case you have other questions. Otherwise, I wish you a great rest of the week!