Well, same story.. There is nothing on WIKI, except that: https://en.bitcoin.it/wiki/Enabling_SSL_on_original_client_daemon

Yes, I installed the module for ZenCart.

The issue is that with PayPal, for example, everything is clear. I register on PayPal, get my credentials, connect my PayPal account to my bank. Everything transparent.

Nothing is transparent to me with BitCoin. Who issues username and userpassword? Where does BitCoin "units" accumulate? How do I convert them do USD $$ and send it to my bank?