PHP - Apply Factory Method Pattern

[ahmedkamaldabour]

This pull request introduces a new implementation of the Factory Method design pattern for payment processing in the codebase. It adds a set of classes and interfaces to support the creation and handling of different payment methods (Visa, MasterCard, American Express) in a scalable and maintainable way. Additionally, it updates the example usage in the main index file to demonstrate the new pattern.

Key changes include:

Factory Method Pattern Implementation:

• Added the PaymentMethod interface, which defines the contract for all payment method classes, including methods for authorization, money transfer, fee calculation, and card details management.
• Implemented concrete payment method classes: Visa, MasterCard, and AmericanExpress, each providing specific logic for their respective card types. [1] [2] [3]
• Introduced the PaymentMethodFactory class, which creates instances of the appropriate payment method based on the card type provided.
• Added the PaymentProcessor class, which uses the factory to process payments in a unified way, demonstrating the Factory Method pattern in action.

Example and Usage Updates:

• Updated index.php to comment out the previous newsletter example and add a new example demonstrating how to use the PaymentProcessor and Factory Method pattern for payment processing.