Track SMS delivery status using Plivo's webhook feature, which sends real-time updates to your application. Configure a callback URL in your Plivo settings and your application will receive delivery reports via HTTP POST requests to this URL. These reports contain details like message status, UUID, and error codes.

A Plivo Message UUID is a unique identifier assigned to each SMS message sent through the Plivo platform. This UUID is crucial for tracking the delivery status of individual messages and associating them with specific delivery reports received via webhooks.

Plivo uses webhooks (callbacks) for delivery reports to provide real-time status updates as they happen. Instead of your application constantly polling Plivo for updates, Plivo pushes the information to your application as soon as it's available, making the process more efficient and responsive.

Use ngrok during local development with Plivo to expose your local server to the internet, allowing Plivo to send webhooks to your machine. Ngrok creates a public URL that tunnels requests to your localhost, essential for testing webhook functionality before deployment.

Yes, you can send SMS messages using Plivo's Node.js SDK. The SDK simplifies interaction with the Plivo API. Include the recipient's number, the message text, and the callback URL for receiving delivery status updates.

Set up the SMS delivery report URL by specifying the url parameter in the client.messages.create() function when sending a message using the Plivo Node.js SDK. This URL points to your application's endpoint where Plivo will send the delivery status updates. The URL should use HTTPS if possible.

The Plivo Node.js SDK simplifies interaction with the Plivo API, allowing developers to easily send SMS messages, make calls, and manage other Plivo services directly from their Node.js applications. The SDK handles authentication, request formatting, and response parsing.

Verify the Plivo webhook signature using the X-Plivo-Signature-V2 header and the crypto module in Node.js. Compute the HMAC-SHA256 hash of the webhook request URL concatenated with the nonce (X-Plivo-Signature-V2-Nonce) using your Plivo Auth Token as the key. Compare this hash with the received signature using crypto.timingSafeEqual() to prevent timing attacks.

The 'Status: delivered' in a Plivo callback indicates that the SMS message was successfully delivered to the recipient's handset. This signifies a successful transmission and confirms that the message reached its intended destination, allowing your system to proceed accordingly, for example by marking the message as successfully sent in your application's database.

Plivo requires phone numbers to be in E.164 format (e.g., +14155551234) to ensure consistent and unambiguous number representation for global SMS delivery. This standardized format facilitates accurate routing and delivery of messages across different countries and carriers.

Handle multiple Message UUIDs in Plivo callbacks by processing each UUID individually, as each represents a segment of a long SMS. Update the status for each segment in your database. You might choose to track all segment statuses or focus on the first segment's status as a general indicator of delivery.

Common causes of Plivo signature verification failures include incorrect Auth Tokens, URL mismatches between the one sent to Plivo and the one reconstructed on your server, and incorrect usage of the nonce header. Double-check all parameters and ensure URL reconstruction accounts for proxies and non-standard ports.

Troubleshoot Plivo SMS sending issues by checking for accurate Plivo Auth ID, Auth Token, and Sender ID. Verify recipient numbers are in valid E.164 format and within allowed sending limits of your Plivo account type (e.g., sandbox limitations). Inspect Plivo logs for error messages and check your application logs for request failures or exceptions.