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src/checkout/checkout.controller.ts
@Controller('checkout')
export class CheckoutController {
  constructor(private svc: CheckoutService) {}

  @Post('session')
  createSession(@Body() dto: CreateSessionDto) {
    return this.svc.createSession(dto)
  }
}
Architecture briefing
FACT

POST /checkout/session is handled by CheckoutController.createSession — traced from source.

FACT

CheckoutService calls the payment gateway before writing to the ledger.

INFERENCE

Idempotency is likely enforced via an idempotency-key header, based on naming — not confirmed by a stored contract.

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RepoPrep parses code, extracts AST symbols, builds relationship graphs, and grounds every explanation in actual source files.

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GitHub repository

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02

Deep analysis

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Project knowledge

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04

Interview prep

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05

AI practice

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