Here are the steps to pay your invoice and update your payment in the system.

1) Open the email invoice email sent to you.
    Email Title:  Canadian Mortgage App sent you an invoice (XXXXXXX)

2) Click on "View Invoice" (highlighted in red). 

3) Update your payment details. To avoid having to enter your card details every time the invoice arrives, tick the box "Save this credit card to an account with the Canadian Mortgage App". Once that is done, click on the Pay button.