For Windows Desktop Edition,
-There is no phone entry field in the customer registration section.
-The currency field is not required. Already setting the base unit. This field can be optional.
-Custom areas can only be added to the bottom. However, it should be possible to reorder from top to bottom with fixed fields. Or special fields should be added between fixed fields.
These are my ideas for convenience.
I think this should be the sort.
Name and surname
Tax ID (Custom Field)
Cell phone (Custom Field)