Yes, though some actions are usually considered to imply consent... for example, if someone tells you the dollar amount of a bill, and you hand them your card, you can't reasonably argue later that you just wanted to show them the picture on the front.
Yes.
Yes
Yes, it is illegal to use someone else's credit card without their permission, even if they have given you consent to use it. This is considered credit card fraud and is punishable by law.
It may not be illegal, but it would certainly be invalid. The credit card holder is the only person legally entitled to sign his credit receipt.
Threats can be illegal. This would not be a safe thing to do and could lead to criminal prosecution.
Yes
(in the US) Unfortunately - yes.
No.
I dont belive so.
No, you cannot apply for a credit card in your husband's name without his signature and consent.
Yes, using someone else's credit card without their permission is considered credit card fraud and is illegal. It can result in criminal charges and other legal consequences. Always obtain explicit consent before using someone else's credit card.
It is possible that you have been a victim of a scam if someone paid off your credit card without your knowledge or consent. It is important to review your credit card statements and contact your credit card company to investigate further.