Which permission allows an external application to update coupons according to the OCAPI definitions?

The correct choice is the one that specifically states that it allows an external application to update coupons. In Salesforce Commerce Cloud, permissions define the actions an external application can perform on specific resources via OCAPI (Open Commerce API).

When focusing on the necessity to update coupons, it is essential that the permission granted is specifically tailored to the action of updating rather than creating or deleting. This ensures that the external application has the appropriate level of access to make modifications without having excess permissions for actions that are not needed—in this case, the creation or deletion of coupons.

The other options imply broader permissions that encompass multiple actions (such as creating, deleting, and updating), which may not be necessary or desired when the requirement is specifically for updating only. It’s crucial in system design to adhere to the principle of least privilege, granting only those permissions that are essential for a given task. By having a focused permission set, you minimize security risks and ensure that applications interact with the system in a controlled manner.