Create a RedwoodJS service to handle the Infobip integration, generate a serverless function to expose an API endpoint, and use the Infobip Node.js SDK to send messages. This setup allows you to trigger SMS messages via API calls from your RedwoodJS application.

A RedwoodJS service encapsulates the core logic for sending SMS messages using the Infobip API. It interacts directly with the Infobip Node.js SDK, handling message construction, API calls, and error management, keeping your API function clean and focused.

Storing sensitive credentials like API keys in environment variables enhances security by preventing them from being hardcoded into your application and accidentally exposed in version control. This is essential for protecting your Infobip account and managing different configurations across environments.

Initialize the Infobip client lazily—only when it's first needed. This optimization improves efficiency by creating the client instance only when a message is being sent, rather than every time the service is loaded.

Implement comprehensive error handling at both the service and function levels. Check for configuration errors, validate input, use try-catch blocks around API calls, log detailed errors, and return user-friendly error messages to the client without revealing sensitive information.

The handler function is the entry point of your serverless function. It receives the incoming API request, extracts data, calls the sendSms service, and sends a structured JSON response based on the service's outcome (success or failure).

Log in to your Infobip account, navigate to the 'Developers' section, and generate an API key with SMS permissions. Your base URL will also be found in the 'Developers' section, usually in the API Reference or main dashboard area.

The Sender ID is the phone number or alphanumeric name that will appear as the sender of your SMS messages. You must register and approve your Sender ID within your Infobip account before using it in your application.

Yes, use `yarn rw dev` to start the RedwoodJS development server, then use a tool like `curl` to send a test POST request to the `/sendSms` endpoint. Replace placeholders with your phone number and test message content.

Check for common errors such as authentication failures (verify API key), invalid destination addresses (ensure E.164 format), unknown sender IDs (register on Infobip), and free trial limitations (sending limits apply). Examine server logs for detailed error messages from Infobip.

Secure the `/api/sendSms` endpoint using authentication methods like RedwoodJS's built-in auth or API gateway keys to prevent unauthorized access. This is critical to prevent abuse and ensure only authorized users can send SMS messages.

Rate limiting prevents abuse (both accidental and intentional) and helps manage costs by controlling the number of SMS messages sent within a specific timeframe. It can be done at the API gateway level or using dedicated rate limiting libraries within the function.

Configure your environment variables securely in your deployment provider's settings, never committing your `.env` file. Consult the RedwoodJS deployment documentation for your specific provider for detailed instructions.

For production systems, implement delivery report handling via webhooks or polling to confirm message delivery to recipients' handsets. Also consider adding unit and integration tests to ensure continued functionality.