I am building a cryptocurrency application and wanted to sync the watch face app with my websites user, or allow the user a few customizable options.

There are 1,400+ cryptocurrencies and I do not want to make one app per currency.

Option 1

Some watch faces have a ‘customize’ button with additional watch face options, how do I create one of those? I would like to add a drop down the user can select a currency to ‘watch’. Somewhere it said the ‘customize’ button was reserved to partners?

Option 2

Get a unique identifier the user can sync with my website so they can change the display from my website. So far from the documenation I can not get the users email, or device unique identifier?