payment_api

   You need to give phone number(which is unique) along with a password and an initial balance(minimum 5000)
   
   The case where user does not maintain the minimum balance of Rs 5000

   The case where user does maintain the minimum balance of Rs 5000 and the account is successfully created

   The case where an account linked with the given phone number alreday exist

   You need to give your phone number along with the correct password and the amount to be added.
   
   The case where the given phone number does not have a wallet account yet

   The case where the password of the given phone number is not correct

   The case where the phone number and password are valid and the specified amount is credited.

   You need to give your phone number along with the correct password and the amount to be debited. The balance after deduction should be greater than or equal to 5000 otherwise the transaction wouldn't be performed.
   
   The case where the balance after transcation becomes less than 5000 so the transaction is not performed.

   The case where the balance after the transaction is greater than 5000 so the transaction is performed.

   You need to give the phone number nad the corresponding valid password.