[CODE]: Polymorphism: Payment System #155

Problem Description:
Create a Payment System that allows the user to make payments through different methods (Credit Card, PayPal, Cash). Use polymorphism to define different payment methods using the same interface.

Location:
https://github.com/patil-rushikesh/cpp_programs/tree/main/Examples

Attributes:
Payment class (base class):
amount (float) – Amount to be paid.
CreditCard class:
cardNumber (string) – Credit card number.
expirationDate (string) – Expiry date of the credit card.
CVV (int) – Card Verification Value.
PayPal class:
email (string) – PayPal account email.
Cash class:
No additional attributes for cash payments.

Methods:
pay() – The method for processing a payment (to be overridden in each derived class).
The program should be menu-driven, allowing the user to:

1. Choose a payment method (Credit Card, PayPal, Cash).
2. Enter payment details.
3. Process the payment (using the appropriate method based on the user's choice).
4. Exit the program.

Requirements for the Issue:

1. Create the base class Payment.
2. Implement derived classes for CreditCard, PayPal, and Cash.
3. Use function overriding to implement pay() differently for each payment method.
4. Provide a menu-driven interface for interacting with the system.