2 host = hostname of the machine where you run this program
3 port = choose a port number
4 password = choose a password
7 instance = the hostname of your sql server
8 name = the database name
9 user = your database username
10 password = your database password
13 server = the electrum server you will use
14 mpk = the master public key of your wallet (in hexadecimal)
17 received = URL where we POST json data when payment has been received
18 expired = URL where we POST json data if payment has expired
19 password = password sent in the json data, for authentication