Im trying to implement mobile commerce functionality as a feature on a native android app. ebay does not have a mobile SDK so most of the features need to be implemented from the API`s , which would require lot of effort to replicate. I need some customisation especially on the checkout page. The problem is that the sandbox URL does not have mobile web support so I'm not able to customise at the checkout page. Is there any workaround to replicate mobile checkout on the sandbox or customise production URL on the checkout page.