Defined Mercado Pago checkout architecture and template scope

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Defined Mercado Pago checkout architecture and template scope

  • Day: 2026-06-28
  • Time: 12:10 to 12:20
  • Project: Dev
  • Workspace: WP 1: Strategic / Growth & Development
  • Status: Completed
  • Priority: HIGH
  • Assignee: Matías Nehuen Iglesias
  • Tags: Mercado-Pago, Nextjs, Idempotency, Webhooks, State-Machine, Templates

Description

Session Goal

Clarify the implementation strategy for a commerce flow in Next.js where Mercado Pago is treated as an architectural constraint, not just a checkout widget. The session focused on preventing duplicate payments, handling retries safely, and avoiding inconsistent order states while also deciding how much template scaffolding should be adopted for Milestone 0.

Key Activities

  • Reframed Mercado Pago integration as a reconciliation flow: internal order creation, payment preference generation, webhook reception, signature validation, idempotent processing, and state transitions.
  • Proposed a state-machine approach for order/payment lifecycle management to keep production invariants intact.
  • Outlined a layered implementation plan for Next.js, including data model, webhook verification, and reconciliation logic.
  • Considered team/architecture alignment: shared TypeScript contracts, early integration, fixtures, environments, tests, analytics, and PR rules to support scaling from catalog → order → checkout → webhook → operations.
  • Reviewed template strategy for Milestone 0 and concluded that available templates add premature product dependencies.

Achievements

  • Established a clear architectural principle: Mercado Pago must be handled as a consistency and idempotency problem.
  • Clarified that the checkout should be built around internal order state + external payment reconciliation, rather than a simple payment button flow.
  • Decided to prefer a clean vanilla skeleton with shared contracts over coupled templates for the initial milestone.
  • Narrowed implementation scope by rejecting unnecessary auth/CMS/database complexity at the start.

Pending Tasks

  • Implement the minimal Next.js skeleton and shared TypeScript contracts.
  • Define the order/payment state machine and webhook reconciliation logic in code.
  • Add signature validation, idempotency guards, and retry-safe processing.
  • Create fixtures, test coverage, and environment setup for Milestone 0.
  • Revisit static-site showcase/template extraction only if later needed.

Evidence

  • source_file=2026-06-28.sessions.jsonl, line_number=6, event_count=0, session_id=efe210a0f761314da65d23419fb986d67896bd162807ecd56892bf06e961a351
  • event_ids: []

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