You can create a Make a Payment button on your profile's navigation bar for customers to pay invoices online. Customers will be able to pay using Visa, Mastercard, American Express, Discover Card, PayPal or Debit using the PayPal payment gateway.
Under the Sell Online tab of your Business Control Panel, choose the Store Settings link to customize your online store. Or, from anywhere in your Business Control Panel other than the Dashboard, click the cog-wheel icon below the navigation bar next to “Now editing {your business name}.
Enter the email address affiliated with your PayPal account in the PayPal Email field. If you do not have a PayPal account, click the Learn how to set up a PayPal account link to the right of the PayPal Email field for instructions and access to the PayPal account setup wizard.
Scroll to the Online Payment Link field and create a name for the button (such as "Pay My Invoice"). The default name is "Make a Payment."
Make sure the box for "Hide Payment Link" is unchecked.
Select the currency of your pricing in the Currency menu.
Scroll to the bottom of the Store Settings to click Save Changes.