Bought Windows 8.1 pro key, arrives 3 keys, hoping that at least 1 will work, no success

How long are those card valid? Can i link it to accept and withdraw funds via e-commerce platforms like shopify and other (no illegal stuff)? And where i can withdraw it?

are they safe at least for regular (not scam) transactions (ex. card to card, throught markets, aggregators etc.)?

If i use this cards only to receive payments online via invoices and markets like sellfy bank wont block them?