Yes, you can make a payment online. You will need to first login to the website.
If you have your reference/billing number available, consider using the Bill Pay option for logging in. Just enter your: Last Name and a billing/reference number, and you will be directed to your Billing Detail page.
Once there, you can select all or just some of the invoices you would like to pay for online with a credit card. Click on the Pay Checked Items button and you will proceed to the Make a Payment page for those items.