Step 1:
Got to MORE on the menu tab
Step 2:
Select Global Settings
Step 3:
Select notifications
Step 4:
Add which admin will get an email if payment fails when a client pays an invoice
https://share.hsforms.com/1yIx2IRKyQQaVcMJW8kLbJg39wil
Admin email when invoice payment fails
If an invoice payment fails, admin get an email notification