One touch purchasing
I want to be able to launch Onescan from the web page on my mobile phone
Yep this is in place and ready for use
It's here (has been for a while in fact). You can configure the padlock to display as a button (or combination) when it's displayed on a mobile device. Using intents we know to jump into Onescan from there. Using intents URLs on your own pages can have the very same result too!