Does anyone know how customer data is mutated in the following cases:
1) On customer creation (ie. new multipass token, but user doesn't exist in Shopify so a new user is created).
Specifically, if I add an `accepts_marketing` to the token, will the user be created with this value in mind, or is it ignored?
2) For existing shopify customers, if I pass a valid value (ie. `first_name`) into multipass token, and its different from the value in Shopify, does that value get updated? Or is it ignored.