WhatsApp API buat kirim notifikasi pesanan

You are helping me integrate WatZap into my app with the official SDK @watzapid/sdk (TypeScript/JavaScript, Node.js 18+). Use only the methods and options listed here. Do not invent others.

SETUP
- Install: npm install @watzapid/sdk
- ESM: import { WatZap } from '@watzapid/sdk'   CommonJS: const { WatZap } = require('@watzapid/sdk')
- const wz = new WatZap()  // reads the API key from the WATZAP_API_KEY environment variable
- Server-side only. Never put the API key in frontend code or in the repository.
- List methods return a PagedList: `await` it for one page ({ items, page, perPage, total, hasNextPage }), or `for await (const item of ...)` for every item.

WHATSAPP: WABA (official). Sends return Promise<{ id, raw }>; id is the Meta message ID (wamid).
- wz.whatsapp.messages.sendText({ to, text })
- wz.whatsapp.messages.sendTemplate({ to, template, language?, variables?, header?, buttons?, otpCode? })
  - variables: an object for NAMED templates, an array for POSITIONAL templates ({{1}}, {{2}})
  - header: { url, filename? }; buttons: { urlSuffix?: string | { [buttonIndex]: string }, couponCode?: string }
- wz.whatsapp.messages.sendImage|sendDocument|sendVideo({ to, url, caption? }); sendAudio({ to, url }); react({ to, messageId, emoji })
- wz.whatsapp.messages.sendButtons({ to, body, buttons: [{ id, title }] (1-3, title max 20 bytes), header?, footer? })
- wz.whatsapp.messages.sendList({ to, body, buttonText, sections: [{ title?, rows: [{ id, title, description? }] }] })
- wz.whatsapp.messages.sendLocation({ to, latitude, longitude, name?, address? }); sendContacts({ to, contacts }); sendRaw(payload)
- wz.whatsapp.messages.get(id) / status(id) / list({ status?, phone?, page?, perPage? }) / stats()
- wz.whatsapp.templates.list({ wabaId?, status?, search? }) / get(templateId | { name, wabaId, language? }) / status(ref) / create({ name, category, language, components }) / delete(ref) / sync()
- wz.whatsapp.webhook(wabaId).set(url) / get() / unset()
- Text and media only reach users who messaged the business in the last 24 hours. Otherwise use sendTemplate.
- Do not use wz.whatsapp.broadcasts to send campaigns: the server does not process broadcasts created through the API yet.

WHATSAPP: UNOFFICIAL. numberKey is the 16-character key of a linked number. Sends return { message, senderNumber, raw } with no message ID.
- const device = wz.unofficial.device(numberKey)
- device.messages.sendText({ to, text }) / sendImage({ to, url, caption? }) / sendFile({ to, url })
- device.groups.list() / device.groups.sendText({ groupId, text }) / sendImage({ groupId, url, caption? }) / sendFile({ groupId, url })
- device.validateNumber(phone); device.webhook.set(url) / get() / unset()
- wz.unofficial.conversations.list() / get(id) / messages(id) / markRead(id) / archive(id, archived?)

SHARED
- wz.senders.list() returns every WABA and Unofficial number with its numberKey / wabaId and status
- wz.contacts.list({ listId? }) / get({ contactId } | { phone } | { externalId }) / upsert({ listId, phone?, externalId?, name?, source?, status? }) / delete(contactId) / optIn({ phone }) / optOut({ phone })
  - upsert overwrites fields you leave out with empty values: always send every field you want to keep
  - opt-out is only recorded: check it yourself before sending
- wz.lists.list() / get(listId) / create({ name, customFields? }) / update(listId, {...}) / delete(listId)
- wz.lists.subscribers.list(listId, { channel? }) / get(listId, id) / upsert(listId, { phone?, email?, externalId?, name?, customFields? }) / delete(listId, id) / bulkUpsert(listId, items) / sync(listId, items, { markMissingInactive? })
- wz.media.uploadUrl({ url }) / list() / get(id) / download(id) / delete(id)
- wz.automations.bots() / rules() / n8nConfig() / n8nLogs() / n8nStats()

PHONE NUMBERS: 08xxx, 62xxx and +62xxx are all accepted and normalized. Use a leading + for non-Indonesian numbers.

ERRORS
- Every error extends WatZapError and has name, message, code, httpStatus, response, mayHaveBeenProcessed; RateLimitError also has retryAfterSeconds.
- Classes: ValidationError (bad input, checked by the SDK or the server), AuthenticationError, PermissionDeniedError, NotFoundError, ConflictError, InsufficientCreditsError, UnprocessableError, RateLimitError, ProviderError, InternalServerError, APIConnectionError, APITimeoutError, APIUserAbortError.
- The SDK already retries whenever it is safe. Do not wrap WhatsApp sends in your own retry loop.
- If err.mayHaveBeenProcessed is true, the message may already have been delivered: check wz.whatsapp.messages.status(id) or log it; do not resend automatically.

Now write the code for this: <DESCRIBE WHAT YOU WANT TO BUILD>