Stable APIs
v1
Versioned contract discipline.
Developer depth
Build With Explicit Contracts And Runtime Guardrails
Zentra is designed for teams that need typed APIs, replay-safe callbacks, and operator-visible traces before the first production cutover.
- Versioned contracts
- Replay-safe callbacks
- Tenant-scoped auth
api/v1/transfersstable
POST /transfers
idempotency_key: trf_8172
amount_minor: 125000
currency: "USD"
Webhook event
status: processing
attempt: 2
signature: verified
Contract guarantees
Stable error codes
Replay-safe retries
Typed schema evolution
Observed outcome
1 result
Three delivery attempts converge to one ledger-safe mutation.
Webhook Auth
HMAC
Signature verification required.
Write Safety
Idempotent
Replay-safe financial operations.
Auth Boundaries
Tenant Aware
Scoped access across environments.
Integration resources
Docs, SDKs, and runbooks built around the way production actually fails.
Start with stable contracts, validate replay-safe webhook behavior, and promote the same semantics to production without changing the operating language.
API Reference
Versioned contract documentation for payment-critical endpoints.
SDK Guides
Language-specific integration workflows and samples.
Webhook Patterns
Signature verification, retries, and replay-safe consumer handling.
Production Playbooks
Rollout guidance for sandbox-to-production promotion.
Experience
- Web App
- iOS App
- Partner Portal
Orchestration
- Mobile API
- Service Mesh
- Policy Engine
Core Ledger
- Ledger Engine
- Transfers
- Cards
Deterministic money movement and tenant isolation enforced across every layer.
- 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.
Webhook resilience
Callback handling is designed for retries, timeouts, and replay safety.
Security controls
Never process callback payloads before signature verification.
Never process webhook payloads before signature verification, and never apply money-affecting writes without idempotency checks.