Cashier Paystack Laravel Package

Technical Evaluation

Architecture Fit

• Leverages Laravel Cashier’s Design: The package is a direct extension of Laravel’s built-in cashier package, meaning it integrates seamlessly with Laravel’s existing billing infrastructure (e.g., Billable trait, Subscription model, and Invoice handling). This reduces architectural complexity by reusing Laravel’s proven patterns.
• Paystack-Specific Abstraction: Provides a fluent, Paystack-optimized API for subscriptions, plans, and webhooks, abstracting away low-level Paystack SDK calls. Ideal for teams already using Laravel Cashier or migrating from webong-cashier.
• Event-Driven Compatibility: Aligns with Laravel’s event system (e.g., subscription.created, invoice.paid), enabling integration with queues, notifications, and third-party services.
• Potential Gaps:
  • No native support for multi-currency (Paystack is Nigeria-focused; requires manual handling for broader use).
  • Limited customization for Paystack’s unique features (e.g., split payments, multi-business accounts) without extending the package.

Integration Feasibility

• High for Laravel Apps: Minimal refactoring needed if already using laravel/cashier. Replaces Paystack-specific logic with this package’s methods (e.g., createSubscription() instead of raw Paystack SDK calls).
• Low for Non-Laravel Apps: Not applicable; requires Laravel’s ecosystem (e.g., Eloquent, Queues).
• Paystack SDK Dependency: Under the hood, it uses paystack/paystack-php, so existing Paystack integrations (e.g., webhooks) may need updates to align with this package’s event system.

Technical Risk

• Migration Risk:
  • Breaking Changes: If the app uses webong-cashier, migration effort is moderate (API differences may require refactoring).
  • Webhook Handling: Paystack webhooks must be reconfigured to emit Laravel events (e.g., subscription:paid) instead of raw Paystack payloads.
• Testing Overhead:
  • Paystack’s sandbox environment must be tested thoroughly for edge cases (e.g., failed payments, retries).
  • Custom business logic tied to webong-cashier may need validation.
• Long-Term Risk:
  • Maintainer Activity: Low stars/dependents suggest limited community support. Monitor for updates or forks.
  • Paystack API Changes: If Paystack modifies its API, the package may lag in updates (unlike official SDKs).

Key Questions

1. Does the app use laravel/cashier or webong-cashier?
   • If neither, assess whether adopting Laravel Cashier is viable.
2. Are there Paystack-specific features not covered?
   • Example: Split payments, multi-business accounts, or custom invoice templates.
3. How are webhooks currently handled?
   • Will they need rewiring to emit Laravel events?
4. Is multi-currency support required?
   • The package defaults to NGN; additional logic may be needed for other currencies.
5. What’s the fallback plan if the package stagnates?
   • Direct Paystack SDK integration or a fork may be necessary.

Integration Approach

Stack Fit

• Core Stack: Laravel 8+ (tested with PHP 8.0+; check compatibility with your version).
• Dependencies:
  • laravel/cashier (required; conflicts if not installed).
  • paystack/paystack-php (managed by this package).
  • Database: Supports MySQL, PostgreSQL, SQLite (via Laravel migrations).
• Extensions:
  • Queues: Recommended for async webhook processing and subscription jobs.
  • Events: Integrate with Laravel’s event system for notifications (e.g., subscription:created).
  • Testing: Use Laravel’s testing tools (e.g., HttpTests, Mocks) for Paystack interactions.

Migration Path

1. Prerequisites:
   • Upgrade to Laravel 8+ if using an older version.
   • Install laravel/cashier (if not already present).
2. Installation:

   composer require veeqtoh/cashier-paystack
   php artisan vendor:publish --provider="Veeqtoh\CashierPaystack\CashierPaystackServiceProvider"
   php artisan migrate
   

3. Configuration:
   • Update .env with Paystack SECRET_KEY and PUBLIC_KEY.
   • Configure config/cashier-paystack.php (e.g., webhook URL, default plan).
4. Model Setup:
   • Use the Billable trait on user/models:

     use Veeqtoh\CashierPaystack\Billable;
     class User extends Authenticatable { use Billable; }
     

5. Webhook Setup:
   • Update Paystack dashboard to point to POST /paystack-webhook (route defined in the package).
   • Verify webhook signatures using CashierPaystack::verifyWebhook().
6. Code Replacement:
   • Replace direct Paystack SDK calls with package methods:

     // Before (webong-cashier or raw SDK)
     $subscription = Paystack::getClient()->createSubscription($plan);
     
     // After
     $user->newSubscription('main')->create($planId);
     

Compatibility

• Laravel Versions: Tested with Laravel 8/9/10 (check composer.json for exact ranges).
• PHP Versions: Requires PHP 8.0+ (aligns with Laravel’s minimum).
• Paystack API: Assumes Paystack’s latest API; validate against your contract version.
• Database: Migrations are schema-agnostic but assume standard Laravel table structures.

Sequencing

1. Phase 1: Setup & Testing
   • Install and configure the package in a staging environment.
   • Test sandbox subscriptions, payments, and webhooks.
2. Phase 2: Webhook Migration
   • Rewrite webhook handlers to emit Laravel events.
   • Test event listeners (e.g., notifications, analytics).
3. Phase 3: Feature Validation
   • Verify all subscription flows (trial periods, cancellations, retries).
   • Test edge cases (failed payments, refunds).
4. Phase 4: Rollout
   • Deploy to production with feature flags for critical paths.
   • Monitor Paystack webhook delivery and Laravel job queues.

Operational Impact

Maintenance

• Pros:
  • Reduced Boilerplate: Handles Paystack’s quirks (e.g., retries, idempotency) internally.
  • Centralized Updates: Package updates may include Paystack API compatibility fixes.
• Cons:
  • Vendor Lock-in: Custom logic tied to webong-cashier or raw SDK may need porting.
  • Debugging: Issues may require digging into the package’s source or Paystack SDK.
• Recommendations:
  • Monitor Updates: Subscribe to the repo for breaking changes.
  • Fallback Plan: Document how to revert to paystack/paystack-php if needed.

Support

• Community: Limited (6 stars, no dependents). Support may require:
  • GitHub issues (response time unclear).
  • Paystack’s official support for API-level questions.
• Internal Resources:
  • Assign a team member to own Paystack/Laravel Cashier integrations.
  • Document common issues (e.g., webhook failures, currency limits).
• SLAs:
  • Define escalation paths for critical billing failures (e.g., missed webhooks).

Scaling

• Performance:
  • Webhooks: Process asynchronously via Laravel queues to avoid timeouts.
  • Subscriptions: Batch operations (e.g., updateSubscriptions()) may hit Paystack rate limits; implement retries with exponential backoff.
• Load Testing:
  • Simulate high-volume subscription events (e.g., 1000+ webhooks/hour) to validate queue performance.
• Paystack Limits:
  • Monitor Paystack’s rate limits and adjust Laravel’s queue workers accordingly.

Failure Modes

Ramp-Up

• Onboarding Time: 2–5 days for a Laravel-dev team familiar with