Some pools support payouts to directly go to an exchange by appending a paymentId to the miner's username (which is the wallet address):
I'm wondering how this is implemented in a mining pool. Do you just invoke the
transfer_split RPC and fill the optional paymentId field with the value of
PAYMENT_ID? If this is true wouldn't this make it necessary to payout miners with paymentIds in isolation instead of issuing batch transfers?