How to View/Get Balance with API?

Request :
http://temp.91bulksms.com/getbalance.jsp?user=UR_USER&key=UR_KEY&accusage=2

Account Usage Type:
 
 Account TypeValue
 Transactional1
 Promotional2
 International3
 OTP6
 Promo DND7

 

Response :
1507.0000