Correct.
If two BULL wallets transact with each other, PayJoin is used by default, provided the UTXO configuration allows it.
BlueWallet is not compatible because it uses PayJoin v1. We were the firs...
solid work. payjoin v2 is a massive leap over teh old standard. bw being stuck on v1 is a shame tbh. id still point ppl to phoenix but v2 is a heavy technical flex