Can I send invoices on WhatsApp from 399Apps?

What goes out on WhatsApp, app by app

Where each 399Apps app sends a bill today. The Business API connection is your own Meta account; Meta bills messages to you directly at its own rates.

Pricing reflects publicly listed plans and is indicative; verify current pricing with each vendor.

Sending a bill from the counter: Nidhi POS

Ring up the sale in Nidhi POS on a phone, tablet or PC, take Cash, UPI or Card, and the next screen has a Send receipt button. The customer’s number comes from the sale; if there is no number, the button stays off. With your WhatsApp Business account connected through Meta’s official Cloud API, the PDF arrives in the customer’s chat with a line such as “Hi Ravi, here’s your invoice INV-1042 for ₹1,180.00. Thank you for your business!”

You decide once whether that PDF is the 80mm counter slip or the full GST tax invoice. Every sale also posts to Nidhi Books, so the bill on WhatsApp is the same bill that appears in your GST returns.

Until the Business API is approved, the same button opens WhatsApp on your own phone with the message already written and a link where the customer opens the bill. That needs no Meta account and costs nothing; the only difference is a link instead of a PDF in the chat.

Sending an invoice from Nidhi Books

Invoices raised on the Nidhi Books invoice screen, the usual path for a trader or service business billing on credit, are sent by email: one click sends the PDF with a pay link, and the invoice page shows whether the customer opened it. Due-date reminders also go by email.

On WhatsApp, Books gives you quick send: pick the customer on the WhatsApp screen, choose a ready-made message such as “a quick reminder that your invoice is due”, and it opens in your own WhatsApp. The message is built in your browser, and 399Apps never sees it. What it does not do today is attach the invoice PDF, so if a customer wants the PDF on WhatsApp, download it and forward it yourself.

Your own number, not a reseller’s

399Apps is not a WhatsApp Business Solution Provider (BSP) like Wati, Interakt, AiSensy or Gupshup, which typically charge a monthly platform fee and add a markup on each message. You connect your own WhatsApp Business account, so the account, the number and the message templates stay in your Meta Business account, and revoking our access token cuts us off with nothing to cancel.

On any paid plan we do the Meta setup for you, free: business verification, the WhatsApp app, registering your number, the permanent access token and the webhook. Meta’s own verification queue still takes 1 to 14 days. Meta bills each business-initiated message to you at its own published rate, and 399Apps adds nothing on top.

Who this fits, and who should look elsewhere

If you run a counter shop (a kirana, pharmacy, garment or mobile store, a café) and customers would rather get the bill on WhatsApp than on paper, Nidhi POS fits: the send is one tap from the sale, it comes from the number they already have saved as your shop, and the app is ₹399/month with unlimited users.

If you bill mostly on credit from Nidhi Books and need the invoice PDF and automatic payment reminders to go out on WhatsApp by themselves, 399Apps does not do that today. Email covers it here, and a WhatsApp-first collections tool will serve you better until that changes. If you are a trainer or coach billing clients on WhatsApp, our sister product Croodit is built for that. If you run a school, 399apps for Schools is a separate product priced per school.

Sending a GST invoice on WhatsApp does not change its validity: WhatsApp is only the delivery channel, and the invoice still needs the fields GST law requires, which the 399Apps PDF carries.