Once an invoice has been generated for a client, it will be sent to your client's email address, as well as an SMS depending on your notification settings. The notification email will look something like this:

• View Online: Clients are directed to the client portal where they can view, download and print the invoice.
•  Pay: The client is directly taken to checkout.
• Send message: The client is directed to the client portal to message your business.

Further Reading:

• Setting up Payment Notifications