Open network and external integrations

(Section: Ecosystem and Network)

1) Why open network

Open network reduces transaction costs of integrations and accelerates innovation. Standardized contracts, sandboxes and self-service portals turn the ecosystem into a "development platform," where participants quickly create value without coordination at each step.

2) Principles of openess

Open by design: public API/event specifications, examples, SDK.
Security & privacy first: minimum required data, signatures, PII localization.
Backward/forward compatibility: versioning and migration policy.
Observability by default: end-to-end trace-id, structured logs, metrics.
Self-service: keys, webhooks, quotas and reporting - through the portal.
Cost-aware: egress limits, caching, economic guard rails.

3) Integration contracts

3. 1 API (RQ/RS)

Format: REST/gRPC + specification (OpenAPI/Protobuf).
Required headings: 'x-request-id', 'x-idempotency-key', 'traceparent'.
Errors: deterministic codes, retray hints, reference'status _ url'for asynchronous.

3. 2 Events (Pub/Sub)

Поля: `event_id`, `occurred_at`, `producer`, `subject_id`, `schema_version`, `region`, `tenant`.
Guarantees: at-least-once, partitioning by key (user_id/tenant_id), retention for replay.

3. 3 Webhooks

Titles: 'signature', 'timestamp', 'nonce', 'delivery-id'.
Anti-replay: TTL windows, one-time 'nonce', list of used 'delivery-id'.
Behavior: 2xx = reception; exponential retrai with jitter; idempotency at receiver.

4) Security and trust

Authentication: OAuth2/OIDC for client integrations, mTLS for S2S.
Signatures: HMAC/Ed25519; centralized key directory, rotation, and pinning.
Access policies: RBAC/ABAC, "minimally sufficient" scopes, temporary tokens.
Keys and secrets: KMS per-region, separation of duties (M-of-N for critical operations).
Audit: immutable logs (WORM) + Merkle slices and receipts (receipts).

5) Versioning and migrations

SemVer for APIs and event schemas.
Strategy: expand → migrate → contract (add fields → translate consumers → delete old ones).
Breaking releases on the calendar, pre-GA and GA windows, test feeds.
Auto compatibility checks in CI; "green check" for certified integrations.

6) Sandbox, SDK and DevEx

Sandbox: a full-fledged environment with test keys, fixes, mock payments, event generators.
SDK/CLI: fast integration, generating clients according to specifications, copy-paste examples.
Contract catalog: search by domains, versions, regions; changelog and payload examples.
Auto-certification: package of tests for signatures, idempotence, schemes; compatibility badges.

7) SLO/SLA, quotas and fair-use

SLO per-channel: p95/p99 latency, error-rate, success of event deliveries.
SLAs for partners: target availability windows, credit notes/penalties as code.
Quotas/limits: per-key/tenant/region, burst parameters, priorities by level.
Rate-limits and protection: circuit-breakers, backpressure, kill-switch.
Cost-aware routing: with equal delay, a more economical way.

8) Observability and audit

Traceability: end-to-end 'trace _ id '/' span _ id' in all channels (RPC, events, webhooks).
Metrics: latency p50/p95/p99, error-rate, queue lag, cache hits, egress/ingress.
Logs: structured, with 'tenant _ id', 'partner _ id', contract version and region.
Receipts and Merkle-logs: provable delivery/inclusion; automatic reconciliations (diff).
Partner dashboards: consumption, delivery statuses, quotas, incidents, billing.

9) Compliance and privacy

Data minimization: Events carry identifiers/proofs, not extra PII.
Data localization: PII/financial data - in the "zones of trust" of the region; outside - tokens/hashes.
Right to be forgotten: removing primary PIIs without loss of provability (receipts remain).
Policies as code: CI privacy/security checks that block release gates.

10) Partner onboarding (reference flow)

1. Due Diligence: Safety/Compliance, SLA/Economics Alignment.
2. Key issuance: scopes, quotas, temporary access.
3. Sandbox integration: payload examples, auto-certification.
4. Pilot under the ficheflag: limited traffic, guardrails and dashboards.
5. GA launch: publication in the catalog, SLA conditions/billing.
6. Operation: monitoring, reports, regular reviews; versioning/migration.
7. EOL/termination: key revocation, traffic migration, artifact archive.

11) Extension Marketplace

Format: plugins/adapters/bots with showcase, rating and conditions.
Revenue model: royalties/usage fees, tier discounts for large integrators.
Quality: certification, SLO badges, auto compatibility checks for updates.
Security: artifact signing (SBOM), update and rollback policy.

12) Interaction economics

RevShare/CPA/CPL/Marketplace commissions - transparent and formalized in reporting schemes.
Shared-savings: Share savings (for example, reducing egress/chargeback).
Budget-cap: limits on promo/intents, auto-downscale multipliers.
Dispute & escrow: automatic arbitration on signed receipts, temporary escrow.

13) Risks and anti-patterns

Version chaos: The lack of a migration policy is breaking consumers.
Weak security of webhooks: no signature/TTL/nonce → fraud/replays.
Lack of idempotence: double payment/accrual.
Overweight PII: violation of privacy and rising compliance costs.
There is no kill-switch and quotas: one partner "squeezes" the capacity, costs are growing.
Opaque billing: controversy and loss of trust.

14) Open Network Success Metrics

DevEx: TTFI (key-to-first-success), certification time, NPS integrators.
Quality: p95/p99 over channels, webhook delivery success, replication lag.
Economics: cost of 1k events, egress/ingress per partner, ROI of incentive programs.
Reliability: MTTR, share of idempotently processed duplicates, share of transactions covered by receipts.
Network effects: the number of active integrations, the share of traffic through the standardized bus.

15) Implementation checklist

• Publish API/event specifications and version catalog.
• Enable sandbox, SDK/CLI, and auto-certification.
• Configure OAuth2/OIDC and mTLS, webhook signatures (HMAC/Ed25519), TTL/nonce.
• Enter 'x-idempotency-key', 'traceparent', 'x-request-id' everywhere.
• Run Merkle logs and receipts; partner dashboards and billing.
• Define SLO/SLA, quotas, rate-limits, cost-aware routing, and kill-switch.
• Accept the expand → migrate → contract policy and the breaking calendar.
• Formalize economics (RevShare/CPA/Marketplace/Shared-savings) and dispute/escrow rules.
• Localize PII/financial data; in CI - privacy/security checkers.
• Conduct regular GameDays of integrations (retray storm, loss of signature, drift schemes).

16) FAQ

How to speed up onboarding?
Sandbox + ready-made SDKs, contract auto-certification and status endpoints for webhooks.

How to avoid breaking releases?
Strict SemVer, compatibility mode and "expand → migrate → contract" with Pre-GA windows.

Do I need signed telemetry?
For business critical transactions, yes (receipts/signatures). For metrics, correlation and hashes are sufficient.

What to do with "takes"?
Idempotent keys, deduplication at the receiver, and repeat-safe handlers.

Summary: An open network is a combination of standards and discipline: specifications and sandboxes, signatures and idempotency, quotas and cost-aware policies, observability and provable auditing, clear migrations and a fair economy. By following this checklist, the ecosystem receives rapid integrations, predictable quality and sustainable growth.