https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_ECOnMobileDevices I found this FAQ which suggests that you should be able to make a simple change (unless I misunderstand which I probably do and there is more process) /Change the command in your redirect to the Express Checkout flow to _expresscheckout-mobile. If the buyer checks out on PayPal, your redirect will include: https://www.paypal.com/cgi-bin/webscr?cmd=_express-checkout-mobile&token=valueFromSetExpressCheckoutResponse/ I tried using both expresscheckout-mobile and express-checkout-mobile (with the dash) in the button code. It takes me to a blank (white) page. Also with/without the &&token=valueFromSetExpressCheckoutResponse Bob