I'm a UX designer, actually working on a e-commerce website template.
Here are my doubts :
When users want to buy a product, the moment they are doing the address form, if they want to receive the bill to another address (different than the shipping address), should we put :
A checkbox, checked by default on "Same address for billing", and when they uncheck it, users can add the billing address.
An empty checkbox "Add another address for billing", so users check it to add the billing address
A call to action button "Add a different billing address" ?
Wording is absolutely not done, as you read, but it just to give you an idea of my problematic.