To request a balance, use the address:
https://smscentre.com/sys/balance.php?login=<login>&psw=<password>
The following parameters are passed to the server:
Option
The value
login
Customer Login.
psw
Client Password (you can add or change it on this page).
apikey
A special API key used for simplified authorization instead of the "login+password" pair (you can create it on this page).
cur
Flag indicating whether the Client's currency name should be added to the server response.
fmt
Server response format:
0 or 1 – (default) as a string (250.80).
2 – in xml format.
3 – in json format.
Balance Request