One code path drives the UI and the API, so they can never drift apart.

A workspace is a hard boundary, not a filter. Every operation resolves its organization from the trusted auth context — never from the request payload — and every query carries a workspace predicate.

• The organization id comes from the token, never from the body: a payload cannot select a workspace
• Server functions derive context from the Better Auth organization role; the API derives it from the token hash, scopes, and integration source
• Both boundaries converge on the same shared operations, so the UI and the API cannot drift apart in behaviour
• Source-scoped resources additionally verify the integration source that wrote them

Tokens are least-privilege by construction. You pick the scopes at creation time, the token is shown once, and only its SHA-256 hash is stored.

• Independent read/write/delete scopes per resource: products, leads, contacts, companies, deals, orders, customers, inventory, payments, shipments, returns
• Only a SHA-256 hash is persisted; the plaintext token is displayed exactly once
• The narrowest required scope is checked before any business work runs
• A per-IP failed-auth guard rejects a repeatedly-failing caller before the token lookup costs a read

Intake is safe to retry. Send the same externalId twice and you get the same record back — not a duplicate, and not a silent overwrite.

• Replaying an identical payload returns the existing record
• A different payload under the same externalId returns a typed 409 IDEMPOTENCY_CONFLICT rather than clobbering data
• Concurrent replays are serialized by a transaction-scoped advisory lock keyed on workspace + operation + external id
• Durable idempotency records live in the database, so retries stay safe across deployments and instances

Fixed-window limits are enforced in the database, so every serverless instance shares one counter instead of each keeping its own.

• Per workspace + integration source + endpoint — one noisy integration cannot spend another's budget
• x-ratelimit-limit and x-ratelimit-remaining on responses; retry-after on a 429
• Redis-backed limiting layers on when configured, and degrades gracefully to the database when it is not
• The browser widget has its own separate limit and never carries a workspace Bearer token

Every endpoint — Bearer and adapter webhook alike — fails the same structured way, with a request id you can quote to us.

• { error: { type, code, message, requestId } } on every failure
• 400 VALIDATION_ERROR · 401 UNAUTHORIZED · 402 SUBSCRIPTION_INACTIVE · 403 FORBIDDEN / PLAN_LIMIT_EXCEEDED · 404 NOT_FOUND · 409 CONFLICT · 429 RATE_LIMITED
• Validation runs at the boundary through Zod, so a bad payload never reaches business logic
• Internal errors are never leaked: 5xx responses are captured server-side with request context and no secrets

Outbound events are HMAC-signed so you can verify us. Inbound adapters verify the platform's own signature scheme rather than trusting the sender.

• Outbound: HMAC-SHA256 signed deliveries for events such as deal.won, lead.converted, order.delivered
• Durable async delivery with retries when QStash is configured; synchronous delivery when it is not
• Inbound adapters verify each platform's real scheme — HMAC-SHA256, SHA1, ECDSA, or OAuth — read from that platform's official docs, never copied between adapters
• One universal endpoint accepts { resource: lead | order, data } from Zapier, Make, n8n, or your own backend

A third boundary over the same shared operations, so an AI client operates the workspace under exactly the permissions a human would get.

• Streamable HTTP, stateless — nothing to install and no SSE to keep alive
• OAuth 2.1 one-click connect, or the same scoped Bearer token as the REST API
• Tools are projected from your workspace role; each one re-checks its scope, the subscription, and its own rate limit
• No direct database access: every tool goes through the shared operations layer
• get_obriym_product_facts supplies reviewed product claims, limits, pricing and integration readiness in Ukrainian or English; it does not evaluate a particular workspace’s configuration

The contract is written down and kept in step with the routes it describes.

• OpenAPI 3.1 spec at /api/v1/openapi.json
• Interactive reference at /api-docs with a live request builder — public, no account required
• A machine-readable widget descriptor at /widget.json for agents building against the browser boundary
• llms.txt, roadmap.json, and changelog.json publish the same facts for AI agents