Thank you, I'm aware of this, and I'm not going to keep my coins on the exchange, I just want to sell a small amount.
Some advices:
Never use Your stocks.exchange on openledger.io account as address on the croat pool.
Never withdraw Your CROATs from stocks.exchange to openledger.io and vice versa !! (since in this case You do not have access to private keys of exchange addresses, You have no proof for any transaction for their technical support)!!
In case You are new player, You will be surprised with high withdrawal fees for BTC. In this case is usually better to change Your BTC to LTC and then send to Your personal ledger (i.e. Coinbase, or other...)
Thanks for the help. For example, I want to send a part of my croats to the stock exchange, but I need a payment ID, the problem is that it can not be specified in any purse except for the CLI, maybe the GUI supports the payment ID, only send using . or +.
There is a problem that I do not run simplewallet.
since till now You have no official answer, I will try it myself. Do not trust me, I am not insider... Please check Yourself...
GUI and Android APK of CroatCore do not support Payment Id within current version. CLI wallet could support Payment Id, but I am using only GUI and mobile wallet. But You can send the hash of every transaction to Your counterpart. You can find the hash easily within transactions part.
CLI wallet is within directory, where is installed CroatCore GUI in case of Windows OS. There is simplewallet.exe and croatd.exe
I think that there should be Payment Id option, but I am not sure. Bitcointalk user Ridd could give You better support than me.