Svea Laravel Package

Technical Evaluation

Architecture Fit

• Strong alignment with Laravel ecosystem: The package is designed with Laravel in mind, offering a facade, service provider, and Artisan commands, reducing boilerplate for Laravel-based applications.
• Modular design: Core functionality (Checkout, Admin, Subscriptions, Webhooks) is decoupled, allowing selective adoption (e.g., using only Checkout API without Subscriptions).
• Fluent API: The fluent builder pattern (when(), unless()) enhances readability and maintainability, especially for complex order flows.
• Framework-agnostic core: While Laravel-optimized, the package can be used in non-Laravel PHP apps via direct SveaClient instantiation, improving flexibility.

Integration Feasibility

• Seamless Laravel integration: Auto-discovery of the service provider and facade eliminates manual setup, reducing friction.
• Webhook handling: Built-in HMAC-SHA256 verification and SveaWebhookReceived event decouple webhook processing from routes, aligning with Laravel’s event-driven architecture.
• Testing support: Svea::fake() mimics HTTP interactions (similar to Laravel’s Http::fake()), enabling isolated unit/feature tests without external dependencies.
• Idempotency keys: Critical for retry logic in distributed systems (e.g., queues), ensuring safety during transient failures.

Technical Risk

• Dependency on Laravel components: Optional illuminate/support for facades/artisans may introduce version constraints (Laravel 11–13). Non-Laravel users must handle configuration manually.
• Minor-unit convention: Svea’s requirement for minor-unit values (e.g., 29900 for 299.00 SEK) demands careful validation in application logic to avoid arithmetic errors.
• Webhook security: Misconfiguration of webhook_secret or Svea-Signature handling could expose endpoints to replay attacks. Requires rigorous validation in middleware.
• Async task polling: HTTP 202 responses require polling logic, which must be implemented by the consumer (e.g., retries with exponential backoff).

Key Questions

1. Laravel Version Compatibility:

   • How will the team handle potential breaking changes if Laravel 14+ introduces incompatibilities with illuminate/support?
   • Mitigation: Monitor Laravel releases and test early; consider a wrapper layer for facade/artisan logic if needed.

2. Error Handling Strategy:

   • How will SveaApiException hierarchies be mapped to application-level errors (e.g., retries vs. user notifications)?
   • Mitigation: Define a custom exception handler or middleware to standardize responses.

3. Webhook Scaling:

   • What mechanisms will ensure webhook endpoints scale under high-volume traffic (e.g., load balancing, rate limiting)?
   • Mitigation: Use Laravel’s queue system to process webhooks asynchronously.

4. Testing Coverage:

   • Will Svea::fake() suffice for all test scenarios, or are additional mocks needed for edge cases (e.g., retries, async tasks)?
   • Mitigation: Supplement with manual mocks for complex flows.

5. Idempotency in Queues:

   • How will idempotency keys interact with Laravel’s queue system (e.g., duplicate jobs)?
   • Mitigation: Use Laravel’s unique() or uniqueForJob to deduplicate jobs by idempotency key.

Integration Approach

Stack Fit

• Laravel: Ideal for Laravel apps due to built-in facades, service providers, and Artisan commands. Non-Laravel PHP apps can use the core SveaClient with minimal overhead.
• Guzzle HTTP Client: Leverages Guzzle’s middleware stack (e.g., Wiretap for tracing, retries for resilience), which integrates cleanly with Laravel’s HTTP client.
• Event-Driven Architecture: SveaWebhookReceived events enable decoupled processing, aligning with Laravel’s event system (e.g., broadcasting, queues).

Migration Path

1. Pilot Phase:
   • Replace existing Svea integrations (e.g., Checkout, Admin) with nordkit/svea in a single feature (e.g., subscriptions).
   • Use Svea::fake() to test in isolation before cutting over.
2. Gradual Rollout:
   • Migrate webhook handling first (low risk, high visibility).
   • Replace Checkout API calls incrementally, validating responses against the old implementation.
3. Final Cutover:
   • Update configuration (.env, config/svea.php) and remove legacy Svea SDK code.
   • Run feature tests with Svea::fake() to ensure full coverage.

Compatibility

• Laravel 11–13: Fully supported. Test for compatibility if using Laravel 10 or 14+.
• PHP 8.2–8.5: Required. Ensure CI/CD pipelines enforce this constraint.
• Guzzle 7.8+: Dependency is managed by the package; no action needed unless upgrading Guzzle globally.
• Svea API: The package abstracts Svea’s API changes, but breaking changes (e.g., new endpoints) may require updates.

Sequencing

1. Configuration:
   • Publish the config file (php artisan vendor:publish --tag=svea-config) and set .env variables.
2. Webhooks:
   • Register subscriptions via Artisan (php artisan svea:subscription:add) and implement the SveaWebhookReceived event listener.
3. Checkout Flow:
   • Replace checkout creation with the fluent API (e.g., Svea::checkout()->create()).
4. Admin Operations:
   • Migrate deliver/cancel/credit logic to use Svea::admin()->order()->deliver().
5. Testing:
   • Replace mocks with Svea::fake() and add assertions for Svea-specific responses (e.g., Svea::assertCreated()).

Operational Impact

Maintenance

• Low-Ceremony Updates:
  • Composer updates (composer update nordkit/svea) are straightforward due to clear versioning and changelog.
  • Laravel’s auto-discovery reduces maintenance overhead for facades/artisans.
• Configuration Management:
  • Centralized .env and config/svea.php simplify environment-specific tweaks (e.g., test/production URLs).
• Dependency Updates:
  • Monitor guzzlehttp/guzzle and illuminate/support for breaking changes, especially if using Laravel outside 11–13.

Support

• Debugging:
  • Wiretap Integration: Enables HTTP request/response logging for troubleshooting (e.g., failed webhooks, retries).
  • Artisan Commands: svea:subscription:list/get provide visibility into subscription statuses.
  • Typed Exceptions: SveaApiException hierarchy aids in pinpointing issues (e.g., 401 Unauthorized vs. 429 Too Many Requests).
• Error Recovery:
  • Idempotency keys and retries (exponential backoff) mitigate transient failures in Admin operations.
  • Async task polling (TaskResponse) requires application-level handling (e.g., retry queues).

Scaling

• Webhook Load:
  • Laravel’s queue system can process webhooks asynchronously, scaling horizontally with more workers.
  • Rate limiting (e.g., SVEA_MAX_RETRIES) prevents overload during spikes.
• Checkout Throughput:
  • Stateless SveaClient instances scale horizontally; no shared state between requests.
  • Consider connection pooling (e.g., Guzzle’s HandlerStack) for high-volume APIs.
• Database Impact:
  • Minimal; only stores Svea order IDs/snippets (e.g., in orders table). Webhook events can be logged to a svea_webhooks table if auditing is needed.

Failure Modes

Ramp-Up

• Onboarding:
  • For Developers:
    • Start with the example Laravel app to understand the full flow.
    • Focus on Svea::fake() for testing; avoid touching production APIs until ready.
  • For Ops:
    • Document .env requirements and Wiretap