I am going to buy a vps for my mcpe server, and I added my visa virtual card, It says Insufficient Funds, IK there's no money left on my cc, but Why do I need to get charged, if there is 10$ credit, and i think charging my cc is for verifying, and if yes how much charge? And will it be refunded?
You are correct, it is to verify the card, but it doesn't actually charges your card.
It makes a reservation of the amount of the droplet (so from $5 and up).
This is to make sure the account actually holds this sum of money and that the bank doesn't block the transaction, but no money is actually charged from your card.
Then it releases the reservation again.
This is how credit card verification works on most websites. If you want an official answer, you might want to create a ticket with Support.
While I can't comment on you account directly (you'd need to submit a support ticket for more direct info), we receive very limited information on why a card is being declined. Generally, the only info we see is "insufficient funds", "CVV is incorrect", or "card number is incorrect".
If you're card is being declined and you're sure all information is correct, and you're sure that there's funding available, I would call the issuer and see if they can provide more info.
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That said, when it comes to initial setup, a preauth charge is generally used to verify the card has at least some degree of funding (though we don't have access to or know how much or what your limit is -- just to clarify).
These charges generally show as pending and are then removed as they are not actual charges to your account -- they do, however, result in the funds showing as in-use until the hold is removed.
Generally, a preauth is $1-$2.