zindua-sdk

Official server-side Python SDK for Zindua: send transactional email and WhatsApp from FastAPI, Django, Flask, or any Python 3.10+ backend.

FastAPI guide	zindua.run/fastapi
React Email → Zindua	zindua.run/react-email
Full API reference	zindua.run/developers
Dashboard	zindua.run/login

pip install zindua-sdk==1.2.0

With FastAPI helpers:

pip install "zindua-sdk[fastapi]"

Requirements: Python 3.10+. Run only on your backend — never ship ZINDUA_API_KEY to browsers or mobile apps.

---

Before you write code (Dashboard setup)

Zindua is an orchestration layer: you configure delivery and templates in the dashboard, then call send() from your API.

Step 1 — Create a project

1. Sign in at zindua.run/login.
2. Go to Projects → Create project (e.g. My SaaS).
3. Copy the API key:
   • znd_test_… — sandbox (safe for local dev).
   • znd_live_… — production.
4. Set the default language for the project (Dashboard → project settings). Example: fr. This language is used when you omit lang in send().

Step 2 — Connect a delivery service

Channel	Dashboard path	What you configure
Email	Project → Service	Gmail OAuth, Outlook, or custom SMTP. Zindua sends through your provider.
WhatsApp	Project → WhatsApp	Scan QR code to link the number. Required for OTP on WhatsApp.

Without a connected service, send() returns EMAIL_SERVICE_NOT_CONFIGURED or WHATSAPP_NOT_CONNECTED.

Step 3 — Create templates

1. Open Templates → New template.
2. Set a slug (e.g. otp-verification, welcome, password-reset). You pass this slug in send(template=...).
3. Add variables used in the body, e.g. {{code}}, {{appName}}, {{name}}.
4. Add language versions for each locale you support:
   • French (fr) — subject + body with {{code}}.
   • English (en) — same variables, translated copy.
   • Swahili (sw), etc.
5. Pick one language as the template default (used when the requested lang does not exist).

Example template slug otp-verification:

Lang	Subject	Body snippet
fr (default)	Votre code {{appName}}	Votre code est {{code}}. Il expire dans 10 minutes.
en	Your {{appName}} code	Your code is {{code}}. It expires in 10 minutes.

Step 4 — Verify setup from your terminal

export ZINDUA_API_KEY=znd_test_your_key_here
python -m zindua doctor
python -m zindua send --to you@example.com --template otp-verification --var code=482910 --var appName=MyApp

---

Install and configure

pip install zindua-sdk python-dotenv
# FastAPI stack:
pip install "zindua-sdk[fastapi]" uvicorn

# .env — never commit; load via python-dotenv or your host (Railway, Fly.io, etc.)
ZINDUA_API_KEY=znd_test_xxxxxxxxxxxxxxxxxxxxxxxx

# Optional overrides
# ZINDUA_API_BASE_URL=https://zindua.run/api/v1
# ZINDUA_SITE_URL=https://yourapp.com

import os
from dotenv import load_dotenv
from zindua import Zindua

load_dotenv()

zindua = Zindua(api_key=os.environ["ZINDUA_API_KEY"])

---

Send a message

import asyncio
from zindua import Zindua

async def main():
    client = Zindua(api_key="znd_test_xxxxxxxxxxxxxxxxxxxxxxxx")

    # Email (default channel)
    result = await client.send(
        to="user@example.com",
        template="welcome",
        variables={"name": "Alex"},
    )

    # WhatsApp — E.164 phone with +
    result = await client.send(
        to="+243812345678",
        channel="whatsapp",
        template="otp-verification",
        variables={"code": "482910", "appName": "MyApp"},
    )

    print(result.log_id, result.status, result.lang_used)

asyncio.run(main())

WhatsApp anti-ban robot (required)

Zindua’s anti-ban Guardian paces WhatsApp OTP. Rapid or parallel sends look like spam and can ban your linked number.

• Official Python SDK cooperates with the Guardian automatically.
• Prefer a job queue / resend cooldown in production apps.

Guide: WhatsApp anti-ban Guardian

Upgrade (already installed?)

pip install -U zindua-sdk

zindua = Zindua(api_key=os.environ["ZINDUA_API_KEY"])

Sync helpers exist for scripts and WSGI apps: client.send_sync(...), client.get_log_sync(...).

Channel and to must match

The SDK validates locally before calling the API.

channel	Valid to	Rejected
email (default)	user@example.com	+243812345678
whatsapp	+243812345678	user@example.com

---

Template language (lang)

When you create a project, you choose a default language. Each template can have several language versions.

What you pass to send()	What Zindua renders
No lang	Project default language
lang="en" and English exists on the template	English version, result.lang_used == "en"
lang="de" but only fr / en exist	Template default + result.lang_fallback is True

# Use the user's locale from your database or Accept-Language header
user_locale = "fr"  # optional

result = await zindua.send(
    to=contact,
    channel=channel,
    template="otp-verification",
    lang=user_locale,  # omit to use project default
    variables={"code": code, "appName": "MyApp"},
)

if result.lang_fallback:
    # Requested lang was missing; template default was used
    pass

List available langs per template:

data = await zindua.get_templates()
for tpl in data["templates"]:
    print(tpl.slug, tpl.langs, tpl.default_lang, tpl.variables)

---

End-to-end: FastAPI backend + Next.js frontend

Rule: the browser never sees ZINDUA_API_KEY. The Next.js app calls your FastAPI API; FastAPI calls Zindua.

[Next.js browser]  →  POST /api/auth/request-otp  →  [FastAPI]
                                                          ↓
                                                    store OTP in Redis
                                                    zindua.send(...)
                                                          ↓
                                                    [Zindua → Gmail / WhatsApp]

FastAPI — generate OTP, send, verify

# main.py
import os
import secrets
from contextlib import asynccontextmanager

import redis.asyncio as redis
from dotenv import load_dotenv
from fastapi import FastAPI, HTTPException
from pydantic import BaseModel, EmailStr
from zindua import Zindua, ZinduaError

load_dotenv()

redis_client: redis.Redis | None = None


@asynccontextmanager
async def lifespan(app: FastAPI):
    global redis_client
    redis_client = redis.from_url(os.environ["REDIS_URL"])
    yield
    await redis_client.aclose()


app = FastAPI(lifespan=lifespan)
zindua = Zindua(api_key=os.environ["ZINDUA_API_KEY"])


class RequestOtpBody(BaseModel):
    email: EmailStr
    lang: str | None = None  # e.g. "fr", "en" — optional


class VerifyOtpBody(BaseModel):
    email: EmailStr
    code: str


@app.post("/auth/request-otp")
async def request_otp(body: RequestOtpBody):
    code = f"{secrets.randbelow(1_000_000):06d}"
    await redis_client.setex(f"otp:{body.email}", 600, code)

    try:
        result = await zindua.send(
            to=body.email,
            channel="email",
            template="otp-verification",
            lang=body.lang,
            variables={"code": code, "appName": "MyApp"},
        )
    except ZinduaError as exc:
        raise HTTPException(
            status_code=exc.status or 502,
            detail={"code": exc.code, "error": str(exc)},
        ) from exc

    return {"ok": True, "logId": result.log_id, "status": result.status}


@app.post("/auth/verify-otp")
async def verify_otp(body: VerifyOtpBody):
    stored = await redis_client.get(f"otp:{body.email}")
    if not stored or stored.decode() != body.code:
        raise HTTPException(status_code=401, detail="Invalid or expired code")
    await redis_client.delete(f"otp:{body.email}")
    return {"ok": True}

Run locally:

uvicorn main:app --reload
# Open http://127.0.0.1:8000/docs to test routes

FastAPI — dependency injection

from fastapi import Depends
from zindua.integrations.fastapi import ZinduaDep

@app.post("/send-otp")
async def send_otp(to: str, code: str, zindua: ZinduaDep):
    return await zindua.send(
        to=to,
        template="otp-verification",
        variables={"code": code, "appName": "MyApp"},
    )

Install: pip install "zindua-sdk[fastapi]".

Next.js — call your FastAPI backend

// app/login/page.tsx — client component (no Zindua key here)
"use client";

export default function LoginPage() {
  async function requestOtp(email: string, lang?: string) {
    const res = await fetch(`${process.env.NEXT_PUBLIC_API_URL}/auth/request-otp`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ email, lang }),
    });
    if (!res.ok) throw new Error("Failed to send OTP");
    return res.json();
  }

  // ... UI that collects email, calls requestOtp(), then verify endpoint
}

# .env.local (Next.js — public URL of your FastAPI only)
NEXT_PUBLIC_API_URL=http://127.0.0.1:8000

Alternatively, proxy through a Next.js Route Handler (same pattern as @zindua/sdk on Node):

// app/api/auth/request-otp/route.ts
import { NextResponse } from "next/server";

export async function POST(req: Request) {
  const body = await req.json();
  const upstream = await fetch(`${process.env.FASTAPI_URL}/auth/request-otp`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(body),
  });
  return NextResponse.json(await upstream.json(), { status: upstream.status });
}

Use one place for the Zindua key: either FastAPI or a Node BFF — not both unless you run separate projects.

---

Email attachments

Email only. Pass up to 5 HTTPS URLs; Zindua fetches them server-side and attaches the files.

result = await zindua.send(
    to="user@example.com",
    template="invoice",
    variables={"name": "Sarah", "invoiceNumber": "INV-1042"},
    attachments=[
        {"url": "https://cdn.example.com/invoices/inv-1042.pdf", "filename": "invoice.pdf"},
    ],
)

---

Track delivery (get_log)

Every successful send() returns a log_id. Poll status from your backend:

result = await zindua.send(
    to="user@example.com",
    template="welcome",
    variables={"name": "Alex"},
)

log = await zindua.get_log(result.log_id)
print(log.status, log.error, log.opened_at)

Statuses include queued, sent, delivered, failed, etc. For full history, use Dashboard → Logs or configure webhooks.

---

Error handling

from zindua import ZinduaError

try:
    result = await zindua.send(
        to="user@example.com",
        template="otp-verification",
        variables={"code": "482910"},
    )
except ZinduaError as exc:
    # exc.status — HTTP status (400, 422, 429, …)
    # exc.code   — platform code (TEMPLATE_NOT_FOUND, QUOTA_EXCEEDED, …)
    print(exc.code, exc.status, exc.details)

Code	Typical cause	Fix
TEMPLATE_NOT_FOUND	Wrong slug	Match Dashboard → Templates slug
EMAIL_SERVICE_NOT_CONFIGURED	No Gmail/SMTP	Project → Service
WHATSAPP_NOT_CONNECTED	QR not scanned	Project → WhatsApp
QUOTA_EXCEEDED	Plan limit	Upgrade or wait for reset
INVALID_EMAIL / INVALID_PHONE	to does not match channel	Fix payload or let SDK validate early

---

CLI (smoke tests)

Ships with the package — no separate install.

export ZINDUA_API_KEY=znd_test_...
python -m zindua doctor
python -m zindua send --to user@example.com --template otp-verification --var code=482910
python -m zindua send --to +243812345678 --channel whatsapp --template otp-verification --var code=482910

---

API methods

Method	HTTP	Description
send()	POST /send	Queue email or WhatsApp
get_log()	GET /logs/{logId}	Delivery status for one message
get_project()	GET /project	Plan, channels, project metadata
get_templates()	GET /templates	Slugs, langs, variables
upsert_template(slug=…, lang=…, subject=…, body_html=…)	PUT /templates/{slug}/versions/{lang}	Create/update a locale (React Email HTML import)
render_template(template=…, lang=…, variables=…)	POST /templates/render	Interpolate without sending (prefer send)
connect()	POST /connect	Bind key to site URL (WordPress-style)
is_test_mode()	(local)	True for znd_test_ keys

---

Security

Do	Don't
Store ZINDUA_API_KEY in env / secrets manager	Expose the key in React, Flutter, or Swagger on a public URL
Call Zindua from FastAPI, Django, Celery, cron	Import zindua in a public Jupyter notebook with a live key
Store OTPs in Redis/Postgres with TTL	Rely on Zindua to store verification codes
Use znd_test_ in staging	Share znd_live_ keys in chat or git

---

Client options

Zindua(
    api_key="znd_live_xxxxxxxxxxxxxxxxxxxxxxxx",
    base_url="http://localhost:3000/api/v1",  # optional — local Zindua dev only
    timeout=30.0,                              # seconds, max 120
    site_url="https://yourapp.com",            # optional — WordPress / connect flows
)

Environment variables read by get_zindua():

Variable	Required	Description
ZINDUA_API_KEY	Yes	Project API key
ZINDUA_API_BASE_URL	No	Override API base (default https://zindua.run/api/v1)
ZINDUA_SITE_URL	No	Sent as X-Zindua-Site-Url when set

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License

MIT © Zindua