Payments & Fintech Engineer

1. 1
   Course Idempotency & Retry-Safe Systems

   Retry safety is the foundation of payments

2. 2
   Decision guide Where to Store Idempotency Keys
3. 3
   Course Payments & Money APIs
4. 4
   Decision guide Hosted Checkout vs Embedded Fields vs Direct API
5. 5
   Decision guide At-Most-Once vs At-Least-Once vs Effectively-Once
6. 6
   Course Event Sourcing & CQRS

   Immutable history, like a ledger

7. 7
   Decision guide Event Sourcing vs CRUD + Audit Log vs CDC
8. 8
   Decision guide Strong vs Eventual Consistency
9. 9
   Course API Security in Depth
10. 10
    Decision guide Choreography vs Orchestration

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