1. Open the invoice details page
2. Tap the 'Approve' icon
3. Select 'Before work starts' OR 'After work is complete'
4. The customer can use their finger to sign in the signature box. Then, click 'Done Signing'
And that's it!
To view the signature on your invoice:
1. Click the 'Invoice' icon
2. Scroll down to the bottom of the invoice to see the signature with timestamp