I'm happy to pay if I have an offer in hand and it's up to me to decide whether to finalize the paperwork (e.g. onboarding interview), but not for something tha

I'm happy to pay if I have an offer in hand and it's up to me to decide whether to finalize the paperwork (e.g. onboarding interview), but not for something that isn't guaranteed. If they aren't satisfied with a video or phone interview, they had better pay to have me come out.