While you may change your credit card information at the time of paying an invoice, this article provides steps to change the information at any other time.
Steps
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Select the My Account button which can be accessed via the Welcome drop down (top right-hand corner of the navigation menu).
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From within the Billing section, select Add New Credit Card or Disable Credit Card.
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Complete the various fields within the Add New Credit Card section or disable button within Disable Credit Card section.