INPUT
Business number*
Bill account*
Amount*
Pin*
 
API
payBill()

USER STORY
To pay for a bill from the user's account
 
CODE
validate receiver's business account
validate bill account
validate senders acceptable credit limit
validate sender has sufficient balance 
validate pin 
deduct amount from sender
credit merchant 
send sms alert to reciever
send sms alert to sender 
display success to sender