Struggling with Oath and Kaffarah

Assalamu alaikum, I made an oath to Allah SWT and unfortunately broke it, so I need to give kaffarah. I’m still young and don’t have a job or my own bank card, so I asked my parents to help me pay £10 digitally to a charity like Al Ayn. They didn’t want to do it online, though, and instead gave £10 at the masjid. I’m worried because I’m not sure if that money will be used for food, which I intended, or for something like construction. Since the payment was made but it’s unclear where it went, does that mean I’m exempt from kaffarah? Or should I get a friend to pay it on my behalf to make sure it’s done properly? Jazakum Allahu khairan for any advice.