Platform Feature
SDKs & Webhooks for Real-Time Messaging Events
BulkSMS.ca provides official SDKs for 7+ programming languages and real-time webhooks that deliver instant notifications for message delivery, customer replies, status changes, and failures to your HTTP endpoints.
What It Does
Webhooks and SDKs form the real-time layer of the BulkSMS.ca developer platform. Webhooks push instant notifications to your systems when messaging events occur — message delivered, customer replied, message failed, opt-out received, and more. Instead of polling our API for status updates, your application receives HTTP POST requests the moment an event happens. Our official SDKs simplify integration by handling authentication, request formatting, error handling, automatic retries, and webhook signature verification — letting you focus on building your application rather than managing messaging infrastructure.
Real-Time Event Webhooks
Webhooks deliver instant HTTP POST requests to your configured endpoints when specific events occur. Supported events include: Message Delivered, Message Failed, Reply Received, Message Read, Opt-Out Received, Campaign Completed, and Template Approved/Rejected. Each webhook payload includes comprehensive event data, timestamps, and a signature for security verification. Configure multiple webhook endpoints for different event types and environments.
Official SDKs
We provide actively maintained, open-source SDKs for PHP (Composer: bulksmsca/sdk-php), Python (pip: bulksmsca), Node.js (npm: @bulksmsca/sdk), Java (Maven: ca.bulksms:sdk), Ruby (gem: bulksmsca), Go (go get github.com/bulksmsca/sdk-go), and .NET (NuGet: BulkSMS.CA.SDK). Each SDK includes comprehensive documentation, usage examples, type definitions, and test suites.
Webhook Security
All webhook requests include a signature header computed using HMAC-SHA256 with your webhook secret. Verify signatures in your endpoint to ensure requests genuinely come from BulkSMS.ca. IP whitelisting, HTTPS requirement, and request timestamp validation provide additional security layers. Webhook secrets can be rotated regularly without service interruption.
Automatic Retry Logic
If your webhook endpoint returns a non-2xx response or is unreachable, our system automatically retries with exponential backoff: first retry after 1 minute, second after 5 minutes, third after 15 minutes, and final retry after 1 hour. Failed webhooks are logged and visible in your dashboard for troubleshooting. Configure custom retry policies for critical events.
Two-Way Messaging
Build interactive conversational experiences using incoming message webhooks. When customers reply to your messages, a webhook delivers the reply content, sender information, and conversation context to your system. Process the reply, execute business logic, and send responses back through the API — enabling chatbots, customer support systems, survey collection, and appointment management.
Key Benefits
Instant Notifications
Receive event notifications in milliseconds instead of polling API endpoints every few minutes.
Reduced API Calls
Webhooks eliminate the need for status polling, reducing your API usage and simplifying application logic.
Secure Delivery
HMAC-SHA256 signature verification, HTTPS enforcement, and IP whitelisting ensure webhook authenticity.
Reliable Retry
Automatic exponential backoff retry ensures no events are lost even if your endpoint is temporarily unavailable.
Multi-Language SDKs
Official SDKs for 7+ languages handle all integration complexity with minimal code required.
Conversational Ready
Incoming message webhooks enable two-way messaging, chatbots, and interactive customer experiences.
How Businesses Use It
Delivery Status Tracking
Track message delivery in real-time and update your application UI or trigger follow-up actions instantly.
Chatbot Integration
Build WhatsApp and SMS chatbots that receive incoming messages via webhooks and respond through the API.
Customer Support System
Route customer replies to your support team, CRM, or helpdesk system for timely response management.
Survey Response Collection
Collect survey responses in real-time as customers reply to your messaging-based questionnaires.
Campaign Performance Monitoring
Build real-time campaign dashboards that update instantly as delivery and engagement events occur.
Automated Workflows
Trigger business processes like order updates, CRM entries, or alert notifications based on message events.
Frequently Asked Questions
1What are webhooks?
Webhooks are HTTP callbacks that push real-time event notifications from BulkSMS.ca to your application when specific messaging events occur, such as message delivery, replies, or failures.
2What events trigger webhooks?
Supported events include message delivered, message failed, reply received, message read, opt-out received, campaign completed, and template status changes.
3How do I verify webhook authenticity?
Each webhook includes an HMAC-SHA256 signature in the header. Verify this signature using your webhook secret to confirm the request came from BulkSMS.ca.
4What happens if my endpoint is down?
Failed webhooks are automatically retried with exponential backoff up to 4 times. Events are also logged in your dashboard for manual review.
5What SDKs are available?
Official SDKs are available for PHP, Python, Node.js, Java, Ruby, Go, and .NET via standard package managers.
6Can I use webhooks for two-way messaging?
Yes, incoming message webhooks enable two-way conversations. Receive customer replies via webhooks and respond through the API.
7Do I need SDKs to use webhooks?
No, webhooks work with any HTTP endpoint. SDKs simplify integration but are not required for webhook consumption.
8Can I have multiple webhook endpoints?
Yes, you can configure different webhook endpoints for different event types and environments (production, staging, development).
Ready to Get Started?
Talk to our team about how this feature can help your business communication strategy.