To develop an Easy Digital Downloads (EDD) addon for integrating three payment gateways (We will discuss on call), you’ll need to address several key aspects, including gateway APIs, EDD’s payment processing framework, and compatibility with WordPress standards. Below is a detailed breakdown of the requirements:
*********************************************************************
1. General Requirements
– EDD Compatibility: Ensure the addon is compatible with the latest version of EDD.
– WordPress Standards: Follow WordPress coding standards and best practices.
– Secure Transactions: Use secure methods for processing payments (e.g., SSL/TLS).
– Responsive Design: Make sure any frontend elements are mobile-friendly.
– Error Handling: Implement clear error messages and logging for debugging.
– Localization: Add support for translation using `.pot` files.
*********************************************************************
2. Payment Gateway Integration
For each payment gateway, you’ll need:
– API Integration:
– Understand the payment gateway’s API documentation.
– Implement required endpoints (e.g., create payment, refund, webhook handling).
– Authentication:
– Support for API keys, tokens, or other authentication methods required by the gateway.
– Features:
– Support for recurring payments, one-time payments, and refunds if applicable.
– Currency compatibility and multi-currency support.
– Webhook Handling:
– Handle payment notifications (e.g., successful payments, failed payments, refunds).
*********************************************************************
3. Addon Features
– Admin Settings:
– Options to enable/disable each payment gateway.
– Input fields for gateway-specific credentials (API keys, secret keys, etc.).
– Testing and live mode toggle.
– Frontend Features:
– Display gateway options at checkout.
– Provide clear instructions or labels for each gateway.
– Custom Fields:
– Add additional input fields if required by a gateway (e.g., customer notes or special identifiers).
– Transaction Management:
– Record transaction IDs and statuses in EDD’s payment records.
– Add options for admins to manually update transaction statuses.
*********************************************************************
4. Technical Requirements
– EDD Gateway API:
– Use EDD’s `EDD_Payment_Gateway` class for adding gateways.
– Implement `process_payment()` to handle payments.
– Implement `verify_payment()` to handle webhook notifications.
– Hooks and Filters:
– Use EDD hooks and filters to customize functionality as needed.
– Error Logging:
– Log errors using WordPress’s logging system or custom logs.
*********************************************************************
5. Documentation
– User Documentation:
– Provide instructions for setting up and configuring the addon.
– Developer Documentation:
– Document key functions, classes, and integration points for future developers.
*********************************************************************
6. Testing
– Functional Testing:
– Test payments, refunds, and webhooks for each gateway.
– Compatibility Testing:
– Test with popular WordPress themes and plugins.
– Performance Testing:
– Ensure the addon does not slow down the checkout process.
– Security Testing:
– Validate inputs and sanitize outputs to prevent XSS, CSRF, and other vulnerabilities.
*********************************************************************
7. Example Workflow
1. Admin Setup:
– Admin configures gateway credentials in EDD settings.
2. Customer Checkout:
– Customer selects a gateway and completes payment.
3. Payment Processing:
– Gateway API processes payment, and EDD updates the order status.
4. Webhook Notification:
– Gateway sends a webhook, and EDD verifies the payment status.
5. Refunds:
– Admin initiates a refund, which is processed through the gateway API.
*********************************************************************
Deliverables
– Fully functional EDD addon integrating three payment gateways.
– Admin interface for configuration.
– Frontend integration with EDD checkout.
– Documentation and support for installation and use.