I am writing a project for financial research support of a specific item and the edital of this project asks me for the institution's TIN number (Tax Identification Number) or the Value Added Tax Identification Number (VAT) of the company the sells the item. I'm trying to contact the company that is located in USA, but they take too long to respond. I have its FEI number that came in an invoice. Is this FEI number equivalent to the TIN number? So, is it the same to provide the FEI number in place of the TIN or VAT number?