Based on the provided documentation, there is no fee associated with closing or canceling a Discover credit card. This feature is particularly beneficial for businesses that may need to discontinue card acceptance or account usage due to changing operational needs.

While the text confirms the lack of a cancellation fee, it does not provide specific step-by-step instructions (such as phone numbers or web portal navigation) on the technical process for closing the account. For account management tasks, the guide mentions that the Discover mobile app and 24/7 customer service support are available to help cardholders manage their accounts.