/// <summary>
/// Transfers money to a recipient account.
/// </summary>
/// <param name="sum">amount of money to be transfered to another account. Type of currency - one that recipient operates in.</param>
/// <param name="recipient">the account to which the sum will be transfered.</param>
/// <returns>True if transfer succeeded, false otherwise.</returns>
public bool TransferMoney(float sum, Account recipient)
{
return(paymentStrategy.Transfer(sum, recipient, this));
}