How to send an invoice on WhatsApp with a UPI payment link

To send an invoice on WhatsApp in India, attach the invoice as a PDF and put a UPI pay link built from your own UPI ID in the same message. You do not need WhatsApp Business, the WhatsApp Business API or a payment gateway. The money moves bank to bank and nobody takes a cut.

Last updated 7 September 2026 · Written for solo trainers, coaches, tutors and creators in India

The free way, in four steps

1. Make the invoice a file, not a message

A screenshot of a number in a chat is not an invoice. Export a PDF with your name, the client's name, the date, an invoice number, the line items and the total. Google Docs, Canva or any billing app will do it. Invoice numbers must run in sequence — INV-012, INV-013 — because that is what makes a payment traceable months later.

2. Build your UPI pay link

Take your own UPI ID and assemble a standard UPI intent link: upi://pay?pa=your@upi&pn=Your%20Name&am=2500.00&cu=INR&tn=Invoice%20INV-014. Every field is URL-encoded, so a space becomes %20. This is the NPCI deep-link format, so it opens whichever UPI app your client already uses — Google Pay, PhonePe, Paytm, BHIM or their bank app.

3. Send the PDF, the link and the UPI ID in the same message

Attach the PDF, then write one message with the amount, what it covers, the pay link and your UPI ID in plain text. The plain-text UPI ID matters: WhatsApp does not reliably turn upi:// links into a tappable button, so on many phones the link arrives as text your client has to copy. A UPI QR image is the other fallback.

4. Log it and set your own reminder

Write the invoice number, amount and date somewhere you will look again — a notes app, a spreadsheet. When the UPI credit lands in your bank, mark it paid. If nothing arrives in three days, that is your cue to follow up in the same chat.

The UPI link, field by field

A UPI pay link is a single URL following the National Payments Corporation of India (NPCI) deep-linking specification. Every Unified Payments Interface (UPI) app in India understands the same fields, which is why one link works for a client on Google Pay and a client on PhonePe.

Field	What it does	Example
`pa`	Payee address — your UPI ID. Required.	`asha@okicici`
`pn`	Payee name, shown in your client's UPI app before they confirm.	`Asha Menon`
`am`	Amount in rupees. Leave it out and your client types the amount.	`2500.00`
`cu`	Currency. Always INR.	`INR`
`tn`	Transaction note — this is where the invoice number goes.	`Invoice INV-014 Sep`
`tr`	Your own reference ID, so you can match the payment later.	`INV-014`

Assembled, that is upi://pay?pa=asha@okicici&pn=Asha%20Menon&am=2500.00&cu=INR&tn=Invoice%20INV-014. Leave am out and the client types the amount themselves, which is useful for a part payment and risky for everything else.

Why the API and the gateway answers are usually wrong for one person

Search this question and most of the answers are written for a company: set up the WhatsApp Business API through a provider, get message templates approved, add Razorpay or Cashfree, wire up webhooks. All of that is real, and all of it is built for volume — hundreds of orders a day, a support team, refunds and reconciliation to automate.

A Zumba trainer with eighteen students is a different problem. There is no volume to automate, the relationship is the business, and a templated broadcast from a business number is worse than a message in the chat you already have. What that trainer actually needs is a document that looks legitimate, a link that opens a UPI app, and a way to remember who has not paid. What the free WhatsApp Business app and the API each do, and cost, is set out in do I need WhatsApp Business to send invoices?

What breaks when you do it by hand

The link is fragile. WhatsApp does not reliably make upi:// links tappable, so you send the UPI ID and a QR as backup — three things to keep correct instead of one.
Nothing is tracked. The chat is not a ledger. Six weeks later you cannot tell whether the ₹2,500 that arrived on the 4th was Priya's September fee or Ravi's August one.
The follow-up is on you. There is no system telling you it has been ten days. So you either forget, or you remember at 11pm and write the awkward message yourself — here is how to word that one politely.
It does not scale past a handful of clients. Typing amounts by hand is where the wrong number ends up on an invoice, and a wrong number on an invoice is a conversation you do not want.
Nothing is ready for your CA. No numbered series, no monthly total, no export — just a year of chats to scroll through in March.

Who this fits, and who it doesn't

If you invoice fewer than about five people a month, the manual method above is genuinely fine. A PDF, a UPI link and a notes app cost nothing and there is no app to learn.

If you run monthly batches, class packs or retainers — a Zumba or yoga schedule, a tuition batch, a set of coaching clients — the typing and the remembering are what break, and that is what Croodit is built for.

If you sell physical products, need cards and netbanking, or handle refunds, use a real payment gateway such as Razorpay or Cashfree with proper billing software like Vyapar, myBillBook or Zoho Invoice. Croodit is not a payment gateway and is not an accounting suite. We compared the two properly in Vyapar alternative for trainers and coaches.

How Croodit does the same thing in about 30 seconds

Croodit is a WhatsApp invoicing and UPI payment-tracking app for solo service providers in India. Your packages and rates are saved once. You pick a client, tap the packages they bought, and Croodit opens WhatsApp with the message written, the invoice PDF link attached and a UPI pay link ready — you press send. The invoice also carries your UPI QR and your UPI ID, so the fragile-link problem above is covered by design.

After that it tracks paid, pending and overdue, counts down class packs, and on day 3, 7 and 10 it notifies you — not your client — with the reminder already written. Croodit never messages a client by itself and never holds your money: payments go straight to your own UPI ID.

It is free forever for up to 7 clients, with unlimited invoices and reminders to them and no card needed. Croodit Pro lifts that to unlimited clients at ₹199 a month or ₹1,599 a year, after a 14-day free trial.

Questions people ask before they try this

Do I need WhatsApp Business or the WhatsApp Business API to send an invoice?

No. You can send an invoice from the ordinary WhatsApp on your phone, from your own number. The WhatsApp Business API is built for companies sending template messages at volume through a provider, and it is priced and approved for that. A trainer invoicing twelve clients a month does not need it, and the client sees a friendlier chat without it.

Do I need a payment gateway like Razorpay or Cashfree to accept a UPI payment on an invoice?

Not for a straight UPI transfer. A UPI intent link points at your own UPI ID, so the money moves from your client's bank to yours and nobody takes a cut. Gateways earn their fee when you need cards, netbanking, EMI, refunds through an API or automatic reconciliation across hundreds of orders — not when one person is collecting monthly fees.

Why is my upi:// link showing up as plain text in WhatsApp instead of a tappable link?

WhatsApp only auto-links http and https URLs dependably. Custom schemes like upi:// often render as plain text, and behaviour differs between Android and iPhone. That is why the practical version of this message includes three things: the link, your UPI ID as copyable text, and a QR image. Something in that set will work on every client's phone.

I teach three Zumba batches and twelve people pay me monthly — how do I stop chasing them every month?

The chasing is a tracking problem, not a messaging problem. Give every invoice a number and a due date, keep one list of who has paid, and check it on a fixed day rather than whenever you remember. The awkward part shrinks when the follow-up is a routine attached to an invoice number instead of a personal ask you have to work up to.

Do I need GST registration to send an invoice?

No. If you are below the GST threshold you send a plain invoice with no tax lines — it is still a valid document for your records and your client's. If you are registered, your GSTIN, the tax breakdown and the place of supply go on the invoice, and you keep a monthly summary for your CA.