The tx OP mentioned:
https://mempool.space/tx/159e82ff52bc29286b123102d0c4786c386bccb5a52bbfd20b08b0d796ea16b4
was made 6 days ago
Three days ago somebody already made a CPFP for it
https://mempool.space/tx/3fd47e9b5b569d7bc13509f1d6a1ed9f51e5938ac3d104d50f4815e308e27970
but even so, the bumped fee is still too low, from 2 to 13 sat
Since OP didn't mention doing anything, I suppose this was the other guy doing it, so probably an automatic system, one can still hope that during the weekend the whole thing will get confirmed and they will not demand some extra $ for the exchange rate change between the payment days and the day it got confirmed.
If indeed it's a payment processor like Coingate, they will most likely return the amount minus fees immediately after it gets confirmed, this happened to me once because of the gap of 1 hour between blocks that screwed all the fees!