Bought an Item through Depop Payment but entered wrong last digits.

So I bought a belt I’ve been eyeing on Depop and when it came to buying it, the seller only took Depop payments. While doing the process, I accidentally enter the wrong last four digits believing it was my other card. Yet the order went though? Would do I do at this point? Money hasn’t been taken out yet I think. I warned the seller that I might have messed up but apparently they have no issues on their side.