Excel Protected Sheet / User Login Form with automatic username creation/authentication

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Hi There
Im looking for a solution to create a protected Excel Spreedsheet so User needs to login with the username and password in order to access specific sheets inside.
Is there a way to automatically add username inside excel sheet created on 3rd party website. service etc...?

Here is the example senario:

1. User Register on Website XYZ.com with email and password
2. User login to Website XYZ.com
3. User can now access Excel located on XYZ.com(Sheet is macro enabled)
4. User download the sheet from XYZ.com
5. User opens downloded sheet
6. Sheet displays user login form
7. Excel automatically downloads username (Email) and password (In the background) created by user on XYZ.com in previous steps //This is the part I need some help
8. User can now login with his username and access all data asigned to him/her
9. When user change password on XYZ.com,new password will be automatically imported (In the background)in to excel sheet and user will be able to login to the sheet with a new password

Any Help would be highly appriciated