Where can Apple Pay be disabled within the system settings?

The correct choice for disabling Apple Pay within the system settings is found in the Merchant Tools under Site Preferences. This area typically offers overarching settings that apply to the entire site, including configurations relevant to payment methods. Disabling Apple Pay here ensures that it is effectively turned off on a site-wide basis rather than affecting specific payment settings or methods.

Other options relate to different aspects of payment management. For instance, while Payment Settings might focus on the configuration of various payment methods, it does not provide the broader contextual setting needed to disable features like Apple Pay. The section on Site Features might deal with broader site functionalities or integrations but lacks the specific administrative controls necessary for handling payment options. Lastly, the Ordering > Payment Methods section is more likely to allow you to adjust the availability of individual payment types at the point of order rather than disabling them site-wide. Thus, the most appropriate location to disable Apple Pay is indeed within the Site Preferences in Merchant Tools.