Layer 3 — Developer Depth

Build with explicit contracts and operational guardrails

Zentra is built for teams that need deterministic money workflows, replay-safe events, and auditable identity boundaries from day one.

Open Sandbox
Read API Docs
  • Versioned contracts
  • Replay-safe callbacks
  • Tenant-scoped auth

v1

Stable APIs

Versioned contract discipline.

HMAC

Webhook Auth

Signature verification required.

Idempotent

Write Safety

Replay-safe financial operations.

Tenant Aware

Auth Boundaries

Scoped access across environments.

Integration Resources

Docs, SDKs, and runbooks built for production behavior.

Start with stable contracts, validate webhook reliability, and promote the same integration semantics to production.

API Reference

Versioned contract documentation for payment-critical endpoints.

Open resource

SDK Guides

Language-specific integration workflows and samples.

Open resource

Webhook Patterns

Signature verification, retries, and replay-safe consumer handling.

Open resource

Production Playbooks

Rollout guidance for sandbox-to-production promotion.

Open resource
Contract Reliability Loop

  • Versioned route boundaries and predictable schema evolution.
  • Stable error semantics for reconciliation and runbook automation.
  • Backward-compatible migration paths for long-lived clients.

Sandbox parity

Sandbox pathways are contract-equivalent to production endpoints.

Environment tiers

Webhook resilience

Callback handling is designed for retries, timeouts, and replay safety.

Webhook route

Security controls

Never process callback payloads before signature verification.

Security docs

Never process webhook payloads before signature verification, and never apply money-affecting writes without idempotency checks.