Some questions before order WHMCS

1st question:
The component WHMCS billing is certified in Portugal? For legal use in the country.

2nd question:
If initially purchase a license "one time branded" for a domain. If later I want to change the domain assigned to the license, can I?

3rd question:
If I order the license "one time branded", it come with a 30 day money-back guarantee? I want test it before make a final choice.

Sorry for my bad english.

Thanks for ur support.
Best Regards,
Tiago