villapayment3Specs.md

villaPayment3

Project Specification: Payment Integration Endpoint

Objective: Develop a backend system that enables customers to make payments using credit cards, WeChat Pay, Alipay, and QR codes. The system will log transactions in DynamoDB, verify order accuracy via a cost calculation endpoint, and be implemented using Python 3.12 on AWS Lambda, managed with the Serverless Application Model (SAM).

Scope:

1. Payment Processing:

   • Payment Methods:
     • Credit Cards
     • WeChat Pay
     • Alipay
     • QR Code Payments
   • Integration:
     • Utilize Kasikornbank's (KBank) Create Charge API to process payments.
     • Ensure compliance with KBank's API specifications and security requirements.

2. Transaction Logging:

   • Database:
     • Use Amazon DynamoDB to store transaction logs.
   • Data Logged:
     • Transaction ID
     • Payment Method
     • Amount
     • Currency
     • Timestamp
     • Customer Details (as permitted by privacy regulations)
   • Access Patterns:
     • Design DynamoDB tables to efficiently handle anticipated query patterns.

3. Order Verification:

   • Cost Calculation Endpoint:
     • Implement a call to an external endpoint to verify the correctness of each order before processing the payment.
   • Validation:
     • Ensure the order details match the calculated costs to prevent discrepancies.

4. Architecture:

   • Backend:
     • Develop using Python 3.12.
     • Deploy on AWS Lambda for serverless execution.
   • Deployment:
     • Utilize AWS Serverless Application Model (SAM) for infrastructure as code.
   • Scalability:
     • Design the system to handle varying loads efficiently, leveraging AWS's scalable services.

5. Security and Compliance:

   • Data Protection:
     • Ensure all sensitive data is encrypted at rest and in transit.
   • Compliance:
     • Adhere to relevant financial regulations and standards, such as PCI DSS.
   • Authentication:
     • Implement secure authentication mechanisms for API interactions.

6. Integration with Clients:

   • API Endpoints:
     • Develop RESTful APIs to be consumed by web and mobile clients.
   • Documentation:
     • Provide clear API documentation for client integration.
   • Error Handling:
     • Implement comprehensive error handling to ensure robustness and provide meaningful feedback to clients.

7. Testing and Quality Assurance:

   • Unit Testing:
     • Write tests for individual components to ensure functionality.
   • Integration Testing:
     • Test the complete workflow, including payment processing, logging, and order verification.
   • Performance Testing:
     • Assess the system's performance under various load conditions to ensure reliability.

8. Deployment and Monitoring:

   • Continuous Deployment:
     • Set up a CI/CD pipeline for automated testing and deployment.
   • Monitoring:
     • Implement monitoring tools to track system health, performance, and security.
   • Logging:
     • Ensure all system activities are logged for auditing and troubleshooting purposes.

References:

• KBank Create Charge API Documentation:
• AWS Serverless Application Model (SAM):
• DynamoDB with AWS SAM Guide:

Assumptions:

• The web and mobile clients are developed separately and will interact with the backend via the provided APIs.
• All necessary access credentials and API keys for KBank's services are available.
• The cost calculation endpoint is accessible and provides accurate order validations.

Deliverables:

• Fully functional backend system deployed on AWS.
• API documentation for client integration.
• Test reports demonstrating system reliability and performance.
• Deployment scripts and configuration files managed via SAM.

Timeline:

Note: This 14-day timeline assumes the project is partially completed and focuses on the remaining tasks.

• Day 1-2 (December 17-18):

  • Review existing implementation to assess current status.
  • Identify and document remaining tasks and any issues.
  • Set up the development environment, including AWS SAM and necessary AWS services.

• Day 3-4 (December 19-20):

  • Implement payment processing for WeChat Pay and Alipay using KBank's Create Charge API.
  • Ensure compliance with KBank's API specifications and security requirements.

• Day 5-6 (December 21-22):

  • Develop QR code payment processing functionality.
  • Integrate QR code payments into the existing payment processing workflow.

• Day 7-8 (December 23-24):

  • Implement transaction logging in DynamoDB.
  • Design DynamoDB tables to handle anticipated query patterns efficiently.
  • Ensure all necessary transaction details are logged appropriately.

• Day 9-10 (December 25-26):

  • Integrate the cost calculation endpoint to verify order accuracy before processing payments.
  • Implement validation to ensure order details match calculated costs.

• Day 11-12 (December 27-28):

  • Conduct unit and integration testing for all implemented functionalities.
  • Perform performance testing to assess system reliability under various load conditions.

• Day 13 (December 29):

  • Set up a CI/CD pipeline for automated testing and deployment.
  • Implement monitoring tools to track system health, performance, and security.

• Day 14 (December 30):

  • Prepare API documentation for client integration.
  • Review and finalize deployment scripts and configuration files managed via SAM.
  • Deploy the fully functional backend system to AWS.

This timeline ensures that all critical components are addressed systematically, leading to a robust and efficient payment integration endpoint within the 14-day period.

Risks and Mitigations:

• API Changes: Monitor KBank's API for any updates to ensure compatibility.
• Security Threats: Regularly update dependencies and conduct security audits.
• Scalability Issues: Design the system to be stateless and leverage AWS services for scaling.

This specification outlines the development of a robust payment integration endpoint, ensuring secure and efficient processing of various