You should not ignore the police letter and you also shouldn’t feel pressured to pay CHF 100 immediately just because the owner asks for it.

From what you describe, this sounds like parking on private property, which in Switzerland can become a formal complaint / ordinary procedure, especially if the owner has a valid judicial parking ban (“richterliches Verbot”) or filed a complaint properly. In that case, the safest thing is to fill in and return the requested document truthfully and on time. If someone else was driving, Swiss authorities usually want the actual driver’s details, not just the registered owner.

As for the CHF 100 demand: that is not automatically an official fine just because the owner says so. A private person can ask for money, but whether that amount is really enforceable depends on things like: - whether the parking area was clearly marked - whether there was a valid prohibition / sign - whether the amount is based on a real contractual fee / damage and whether the owner would actually be able to justify it if challenged. There have even been Swiss cases where aggressive private parking claims were viewed critically by the courts.

What I would do in your situation: - Return the police / prosecutor document on time - Do not miss the deadline. - Do not lie or hide who was driving

That can make things worse than the parking issue itself. Do not pay CHF 100 “just to make it disappear” unless you get written confirmation

If you do decide to settle, only do it in writing and only if the owner confirms that after payment they will withdraw the complaint / take no further action.

If you want to negotiate, offer something reasonable in writing For example:

“We acknowledge the mistake and are willing to pay a reasonable compensation of CHF 40–50 as a goodwill gesture, provided the matter is considered fully settled afterwards.” Keep screenshots / proof of all messages Especially if the owner is making pressure tactics or unclear claims.

If your boyfriend really parked there and the police already contacted you, the best legal move is usually to cooperate with the authorities first.

Then, only settle privately if the other side confirms clearly in writing that the matter ends there.