To begin making payments on your user account Login to your profile and click Payments.
This will take you to a page detailing your expense and payment history. (This screen will also appear as the last step in any of the items that you are purchasing (e.g. buying parking permits or renting lockers.)
Check off only the items that you are paying at this time. (If you have a Violation under review, make sure this is unchecked until the review process is complete.) You can use shift+click to toggle on or off all payments.
Once you have confirmed the items that you are paying, select the Continue to Checkout button at the side of the page to proceed.
This will bring you to the Payment Type selection screen where you can choose which payment provider you wish to use. When you are finished click Submit Payment button.
This will bring up the Payment Details screen where you will select the payment method you wish to use and complete the fields. To process the payment, select the Process Transaction button at the bottom of the screen. This button may change depending on the payment provider you are using.