Provides Balance API interfaces.
https://www.omise.co/balance-api
Retrieve the balance
retrieve :: {:ok, Map.t} | {:error, Map.t}
Retrieve the balance.
Returns {:ok, balance} if the request is successful, {:error, error} otherwise.
{:ok, balance}
{:error, error}
{:ok, balance} = Omise.Balances.retrieve