Charge Processor

Implement a PaymentProcessor with charge(ref, amountCents): it processes an idempotent charge and returns { chargeId, amountCents }.

Requirements

1. 01charge(ref, amountCents) returning { chargeId, amountCents }.
2. 02A first-seen non-empty ref with a positive integer amountCents creates exactly one charge and stores its result.
3. 03Repeating the same ref and amount returns the original chargeId and amountCents without creating another charge.
4. 04Repeating a ref with a different amount rejects the request and leaves the original charge unchanged.

Constraints

• • Submit one compact engineering spec, not implementation code.
• • The generated artifact must use the declared TypeScript adapter.
• • Scoring rewards observable behavior and prompt efficiency, not runtime.