BE-020 — Implement Notification & Event Delivery API

[dDevAhmed]

BE-020 — Implement Notification & Event Delivery API

📚 Overview

The Notification & Event Delivery API is responsible for delivering real-time and asynchronous notifications across the TruthBounty ecosystem.

As contributors interact with the protocol through claim submissions, verifications, disputes, governance proposals, staking, rewards, and reputation updates, the platform must reliably notify affected users without coupling business logic to communication channels.

Rather than allowing every backend module to send notifications independently, this service centralises event routing, message generation, delivery tracking, retries, and user notification preferences.

The Notification & Event Delivery API will become the dependency for:

• Frontend Notifications
• Mobile Push Notifications
• Email Service
• Governance Alerts
• Moderator Notifications
• Reward Announcements
• AI Assistant Notifications

Every backend service assumes notifications are delivered asynchronously, reliably, and according to user preferences.

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🧠 Background

TruthBounty V2 generates numerous protocol events, including:

• claim creation
• verification completion
• dispute initiation
• dispute resolution
• governance proposal creation
• governance voting
• staking updates
• reward distribution
• reputation changes
• moderation decisions
• administrative announcements

Without a dedicated notification service, individual modules would duplicate delivery logic, increasing maintenance complexity and reducing reliability.

The Notification API acts as the central event distribution hub for all protocol communications.

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🎯 Objectives

Implement a production-ready Notification & Event Delivery API that:

• receives protocol events
• delivers notifications asynchronously
• supports multiple delivery channels
• manages notification preferences
• retries failed deliveries
• tracks delivery status
• exposes monitoring metrics
• returns standardised API responses

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🧩 Technical Scope

1. Notification Event Queue

Implement an asynchronous event queue capable of processing:

• claim events
• verification events
• dispute events
• governance events
• reward events
• reputation updates
• moderator actions
• administrative announcements

Event processing should be fault tolerant.

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2. Notification Channels

Support delivery through:

• in-app notifications
• email
• mobile push notifications
• webhook integrations
• future messaging providers

Each channel should remain independently configurable.

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3. User Notification Preferences

Allow contributors to configure:

• enabled channels
• notification categories
• frequency preferences
• digest mode
• quiet hours
• language preferences

Preferences should be enforced during delivery.

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4. Delivery Tracking

Track:

• queued notifications
• delivered notifications
• failed deliveries
• retry attempts
• opened notifications
• dismissed notifications

Delivery history should be queryable.

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5. Retry Mechanism

Implement automatic retries for:

• temporary delivery failures
• provider outages
• network interruptions
• rate-limited providers

Retry strategies should use configurable exponential backoff.

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6. Notification Templates

Support reusable templates for:

• governance proposals
• rewards
• disputes
• moderation
• account activity
• protocol announcements

Templates should support localisation.

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7. Monitoring

Expose operational metrics including:

• notifications sent
• delivery success rate
• failed deliveries
• queue size
• processing latency
• provider availability

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8. Performance

Implement:

• asynchronous processing
• message batching
• queue prioritisation
• horizontal scalability
• efficient database indexing

High event volumes should not impact application responsiveness.

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9. Future Extensibility

Design the architecture to support:

• SMS delivery
• Telegram integration
• Discord integration
• Slack integration
• browser push notifications
• AI-generated notification summaries

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10. API Standardisation

Return consistent response objects containing:

• notification identifiers
• delivery status
• timestamps
• metadata
• request identifiers

Errors must follow backend API standards.

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✅ Acceptance Criteria

• Notifications are queued successfully.
• Delivery channels operate correctly.
• User preferences are enforced.
• Retry mechanism functions correctly.
• Delivery tracking is available.
• Monitoring metrics are exposed.
• Unit and integration tests pass.

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🧪 Testing Requirements

Implement tests covering:

• event processing
• channel delivery
• notification preferences
• retry logic
• delivery tracking
• queue processing
• concurrent notifications
• monitoring metrics
• template rendering
• performance benchmarking

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📚 Documentation

Update:

• Backend API Documentation
• Notification Architecture
• Event Processing Guide
• OpenAPI Specification
• Operations Manual
• Developer Guide

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🔗 Dependencies

Depends on:

• BE-001 — Implement Backend Authentication Gateway
• BE-004 — Implement Redis Cache & Distributed Session Layer
• BE-011 — Implement Governance API
• BE-013 — Implement Reward Distribution API
• BE-015 — Implement Administration & Moderation API

Blocks:

• Frontend Notifications
• Mobile Notifications
• Governance Alerts
• Reward Announcements
• Moderator Notifications
• AI Assistant Notifications

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🏷 Labels

• backend
• architecture
• realtime
• protocol-critical
• complexity-medium
• stellar-wave

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📊 Complexity

Medium

The Notification & Event Delivery API provides the communication backbone of TruthBounty, ensuring protocol events are delivered reliably across multiple channels while respecting user preferences, supporting high throughput, and remaining resilient to delivery failures.

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⏱ Estimated Effort

5–7 days

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🚀 Definition of Done

• Event queue implemented.
• Multi-channel delivery operational.
• Notification preferences enforced.
• Retry mechanism implemented.
• Delivery tracking available.
• Monitoring metrics exposed.
• Tests passing.
• Documentation updated.
• Ready for integration with the Frontend Notifications, Mobile Notifications, Governance Alerts, Reward Announcements, Moderator Notifications, and AI Assistant Notifications.

[akinboyewaSamson]

@akinboyewaSamson has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello maintainer I’d love to help out with this issue. I’ve checked the current codebase/documentation and know exactly what needs to be updated to make this clearer. I will ensure everything aligns perfectly with your existing contribution guidelines.

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