Gishen-B2B/docs/backend/OVERVIEW.md

Backend overview

Living spec for the shared platform API consumed by Gishen-B2B. This repo implements mocks typed to this contract; the backend service is consolidated later from B2B, Ecom, Mobile, and Admin spec sheets.

Workspace: /Users/kirukib/Desktop/Yaltopia Project/Gishen-B2B

Base URL (future)

https://api.gishenpharmacy.org/v1

Mock adapters in this repo live under src/lib/api/ and src/mocks/.

Tenancy

• Every authenticated request (except public registration) is scoped to an organisation via orgId on the session or explicit path prefix.
• Org lifecycle: pending_activation → active → suspended | closed.
• Pending orgs: SUPER_USER may read status and submitted registration; cannot create members, packages, or migration commits until Admin activates.

X-Org-Id: org_01H...

For single-org sessions, orgId is implicit from JWT/session. Multi-org users (rare in B2B) pass X-Org-Id.

Authentication

Mode (this phase)	Description
Mock demo	/login role selector sets session cookie with role + org + user
Production (future)	OAuth2 / magic link / SSO — TBD with platform auth

Session shape

See entities/session-user.md.

JWT claims (future)

{
  "sub": "usr_01H...",
  "org_id": "org_01H...",
  "roles": ["HR_ADMIN", "FINANCE"],
  "locale": "am",
  "iat": 1710000000,
  "exp": 1710003600
}

RBAC matrix

Resource / action	SUPER_USER	HR_ADMIN	FINANCE	MEMBER
Org profile (commercial read)	✓	✓ (active only)	✓ (active only)	—
Org registration submit	✓ (public path)	—	—	—
Departments CRUD	✓	✓	read	—
Members CRUD / import / invite	✓	✓	read metadata	own row
Packages CRUD	✓	✓	read	own assignment
Migration jobs	✓	✓	read history	—
Finance spend / statements	✓	read aggregates	✓	—
Finance approvals	✓	—	✓	—
Member allowance / orders	✓	—	—	✓
Prescriptions (clinical)	✓ full	withheld	withheld	own only
Settings / verification	✓	✓	—	—

Clinical withhold: HR_ADMIN and FINANCE never receive prescription images, medicine line items, dosages, prescriber notes, or diagnosis-related fields. Aggregates (e.g. “Rx order — ETB 450, category: chronic”) may appear in finance spend. SUPER_USER bypasses withhold for support/disputes.

Error model

All errors return:

{
  "error": {
    "code": "VALIDATION_FAILED",
    "message": "Human-readable summary",
    "details": [
      { "field": "email", "code": "INVALID_FORMAT", "message": "..." }
    ],
    "request_id": "req_01H..."
  }
}

Standard HTTP status codes

Status	Usage
400	Validation failed, malformed JSON
401	Missing or expired session
403	Authenticated but role/org forbids action; clinical withhold
404	Resource not found or not visible in tenant
409	Conflict (duplicate member, job already committed)
422	Business rule violation (org pending, credit exceeded)
429	Rate limit
500	Internal error

Error codes (catalog)

Code	HTTP	Description
UNAUTHENTICATED	401	No valid session
FORBIDDEN	403	Role cannot perform action
CLINICAL_WITHHELD	403	Clinical field requested by HR/Finance
ORG_PENDING	422	Org not yet activated by Admin
ORG_SUSPENDED	422	Org suspended
VALIDATION_FAILED	400	Field-level validation
DUPLICATE_MEMBER	409	Phone/email/employee_id conflict
CREDIT_LIMIT_EXCEEDED	422	Would exceed org credit
MIGRATION_JOB_LOCKED	409	Job already committed or rolled back
INVITE_EXPIRED	422	Invite token expired
NOT_FOUND	404	Generic not found

Pagination

List endpoints accept:

?page=1&page_size=25&sort=-created_at&q=search

Response envelope:

{
  "data": [ ... ],
  "pagination": {
    "page": 1,
    "page_size": 25,
    "total_items": 142,
    "total_pages": 6
  }
}

Default page_size: 25. Max: 100.

Filtering & date ranges

Finance and spend endpoints accept:

?from=2026-01-01&to=2026-01-31&department_id=dept_01H...

ISO 8601 dates in org timezone (default Africa/Addis_Ababa).

File uploads

Multipart for Rx images and migration files:

POST /v1/... 
Content-Type: multipart/form-data

Max file size (Rx page): 10 MB. Accepted: image/jpeg, image/png, application/pdf.

Migration uploads: 50 MB .xlsx, .xls, .csv.

Idempotency

Mutating endpoints that create billing or migration commits accept:

Idempotency-Key: <uuid>

Duplicate keys within 24h return the original response.

Webhooks / events

Domain events published to platform bus; see events/README.md. B2B emits and consumes events for org registration, migration, and prescriptions.

Environment (Vercel frontend)

Variable	Purpose
NEXT_PUBLIC_API_BASE_URL	Platform API base (mock or real)
NEXT_PUBLIC_MOCK_AUTH	true for demo role selector
NEXT_PUBLIC_DEFAULT_LOCALE	en

Document production URL in this file when first Vercel deploy is finalized.

Related docs

• Entities index
• Endpoints index
• Events
• Features INDEX