observe_signup_url/2
Handle a signup of a user, return the follow on page for after the signup. Return {ok, Url}
‘props’ is a map with
properties for the person resource (email, name, etc) ‘signup_props’ is a proplist with ‘identity’ definitions
and optional follow on url ‘ready_page’ An identity definition is \{Kind, Identifier, IsUnique, IsVerified\}
Type:
Return:
#signup_url{}
properties:
props:
map
signup_props:
list