quick-launch

Use when adding a new payment gateway (MercadoPago, PagSeguro, Asaas, etc.) or when needing to understand how provider-entity mappings work - covers adapter creation, factory registration, webhook normalization, and the polymorphic payment_provider_mappings table

Use when implementing features that vary by subscription plan, adding new feature flags or limits, validating plan access in controllers, or modifying plan-gated functionality - provides the 3-layer PlanFeatures pattern and IPlanService integration