A Digital Developer wants to selectivelyretrieve products and process them from an iPhone.

Given that JavaScript controllers cannot be used for this scenario, the best choice is to use OCAPI (Open Commerce API). OCAPI allows external applications to interact with the Salesforce Commerce Cloud platform programmatically. By using OCAPI, the developer can create RESTful services to retrieve product information, which can then be invoked from a native app on an iPhone. This method leverages the capabilities of OCAPI to interact with the system from mobile platforms directly, providing a seamless integration without the need for JavaScript controllers. For more detailed information, the developer can refer to the "OCAPI" section in the Salesforce Commerce Cloud documentation.