2 host = hostname of the machine where you run this program
3 port = choose a port number
4 password = choose a password
7 database = database filename
10 mpk = the master public key of your wallet (in hexadecimal)
11 chain = second part of the mastrer public key (hexadecimal)
12 wallet_path = path where the script will save the wallet
15 received = URL where we POST json data when payment has been received
16 expired = URL where we POST json data if payment has expired
17 password = password sent in the json data, for authentication