Where the dispute usually sits
We see accusations that follow a relationship ending while a card was still being used, a card kept after it was found or left behind, and a roommate challenging charges on a joint account. Others involve an employee using a company card outside of policy, or a card saved in a browser that someone else in the home used. Occasionally someone is accused after buying from a seller who supplied a card number. The settings differ, but the contested questions are usually the same two. Who actually made the charge, and was there permission to make it.
What to gather
A bank's own fraud investigation usually runs on its own track and may already have produced a file before you hear anything. That file is built from documents, which is where your preparation should go as well. Collect statements, the messages or emails where the card was handed over or permission was given, delivery and shipping records, login and device history if you can reach it, and every letter the bank sent. Keep the report number if one exists. Do not approach the account holder to settle it privately while a case or an order is active, because that tends to be read as pressure.
Where we begin
We look at whether the evidence actually points at you rather than at an account you had access to, which is a distinction that gets collapsed early and is worth separating again. We look at whether this is being treated as one incident or as a pattern, since the two are handled very differently. Restitution comes up in many of these matters, and it is worth understanding what paying does and does not resolve before offering anything. Work that involves handling money or cards has its own exposure here, so we raise that at the start.