Enhance Checkout Process with Guest Checkout and Comprehensive Order Flow

[sweep-ai]

This pull request was created by Sweep to resolve the following request by @curtisdelicata:

Missing functions in App/HTTP/CheckoutController.php

Details
You are missing function in you code in this file.

initiateCheckout, processCheckout, etc...

Continue chatting at https://sweep-chat-demo.vercel.app/c/c81c1cd4-a4ba-443f-8ea5-6527ee9063af.

Purpose

Implement a robust and flexible checkout process that supports guest and registered user flows, with comprehensive order management and payment processing.

Description

This pull request introduces a complete checkout workflow in the CheckoutController with the following key enhancements:

• Added guest checkout functionality
• Implemented comprehensive order creation and validation
• Integrated payment processing through a factory pattern
• Created methods for initiating, processing, and confirming checkouts
• Added validation for checkout inputs
• Implemented session management for cart and guest checkout

The new checkout process handles:

• Cart validation
• Shipping method selection
• Order total calculation
• Payment processing
• Order status tracking
• Guest and registered user flows

Summary

• Added new methods to CheckoutController:
  • initiateCheckout()
  • processCheckout()
  • showConfirmation()
  • guestCheckout()
• Implemented payment processing via processPayment()
• Enhanced session management for cart and guest checkout
• Added input validation for checkout process
• Integrated with PaymentGatewayFactory for flexible payment handling