Send the invoice.
Then chase what's owed — without
remembering to.

Getting paid starts with the customer seeing the bill and ends with a nudge when it's overdue. Fast Billing emails invoices, statements and receipts the moment they're raised, then sends payment follow-up on overdue and outstanding amounts over WhatsApp, SMS and email. You set who gets what and when, so the reminder goes out on time — no one in accounts has to remember to chase.

3
channels — WhatsApp, email and SMS
Invoice to nudge
documents out, follow-up on the overdue
You set the rules
who gets what, and exactly when
Message Log
Fast Billing → WhatsApp · Email · SMS
Live
All messages Documents Follow-up
Customer
Message
Recipient
Channel
Status
Desai BrothersInvoice IN-4821 raised
Invoice
Customer
Email
Sent
PricewayReceipt REC-2207
Receipt
Customer
Email
Sent
BikreeOverdue 7 days · ₹42,000
Overdue
Customer
WhatsApp
Sent
Micro IndiaStatement · month-end
Statement
Customer
Email + SMS
Sent
SolidusOutstanding > 30 days
Reminder
Customer
SMS
Sending
Overdue reminder sent Bikree · ₹42,000 · by WhatsApp
Trusted by billing and accounts teams running Fast across India and worldwide
Desai Brothers
Nikhtish Engineering
Micro India
Solidus
Priceway
Bikree
Kakade Laser
Shree Engineering
Jayson Agro
Cement Marshall
Desai Brothers
Nikhtish Engineering
Micro India
Solidus
Priceway
Bikree
Kakade Laser
Shree Engineering
Jayson Agro
Cement Marshall
Documents & follow-up, three channels

Email carries the document.
WhatsApp & SMS chase the payment.

Two jobs, all fired from the same billing data. Email sends the invoice, statement and receipt as a record the customer can file; WhatsApp and SMS send the follow-up nudge where people actually read it. One set of billing events, your choice of channel per message.

Documents & the record
Email invoices, statements & receipts
The tax invoice, the account statement and the payment receipt go to the customer by email the moment they're raised — a PDF they can file, carrying the same values, GST and any QR as the printed copy. It doubles as the paper trail when a customer asks what a figure was.
Invoice by email Account statement Payment receipt Same values as print
Follow-up & reach Where they read it
WhatsApp & SMS payment follow-up
When an invoice goes overdue or an outstanding balance sits too long, a WhatsApp nudge or an SMS reminder lands where the customer will see it — with the invoice number, amount and due date drawn straight from the ledger. A gentle nudge on the due date, a firmer one a week later, both automatic.
Overdue nudge Outstanding reminder WhatsApp & SMS Amount from the ledger
How it works

Billing events fire messages.
Messages get you paid.

No one has to remember to send anything. The billing document and the receivable — the invoice raised, the receipt taken, the due date passed — are the trigger.

Billing Event Happens
An invoice is raised, a receipt is taken, a statement is due, or an invoice crosses its due date
Rule Matches
The event maps to a recipient and a channel — the customer, and WhatsApp, email, SMS or a combination
Message Delivered
The document or the reminder goes out with the invoice number, amount and due date from the ledger
Payment Follows
The customer pays, the receipt goes out, and the outstanding position updates — no manual chasing in between
The message families

Six messages that get the bill seen
and the payment in

Every message is tied to a real document or receivable in payments & follow-up — so the message, the ledger and the customer's copy always agree.

Invoice Email
Email the invoice
The tax invoice goes to the customer by email as a PDF the moment it's raised — same values, GST and QR as the print — so they have it without a courier or a chase.
PDF invoice by email
Sent as it's raised
Same values as the print
No courier or chase
Statement Email
Email the statement
A month-end account statement — invoices, receipts and the running balance — goes to the customer by email, so the whole account is in front of them in one place.
Invoices and receipts listed
Running balance shown
Month-end or on demand
Whole account in one place
Receipt Email
Email the receipt
When a payment is recorded, the receipt is emailed to the customer — confirming what was paid and against which invoice, so nobody has to ask whether it landed.
Sent on payment recorded
Against which invoice
Confirms the amount
Closes the loop
Overdue WhatsApp
Overdue follow-up
When an invoice crosses its due date, a WhatsApp reminder lands with the invoice number, amount and how many days overdue — a nudge on the channel the customer actually reads.
Fires on the due date
Invoice number and amount
Days overdue shown
Read on WhatsApp
Outstanding SMS
Outstanding reminder
An outstanding balance that sits past a threshold triggers an SMS or email reminder, so the account is chased before it becomes a real receivable problem.
Fires past a threshold
SMS or email
Balance from the ledger
Chased before it ages
Rules Who & when
Who gets what, when
Each message type maps to a recipient, a channel and a schedule — so a gentle nudge on the due date and a firmer email a week later are both automatic, exactly as you set them.
Recipient per message
Channel per message
Schedule you set
Escalation built in
01 — Documents by Email

The customer has the bill
before they've asked for it

A bill that sits in a drawer waiting to be posted is a bill that gets paid late. The moment you raise a tax invoice, Fast Billing can email it to the customer as a PDF — the same values, GST and any QR as the printed copy. Statements go out at month-end and receipts on payment, so the customer always has the document, and your team never chases a copy.

Tax invoice emailed as it's raised
Account statements at month-end or on demand
Receipts emailed on payment
Same document as the printed copy
Document → emailed to customer
RaisedTax invoice IN-4821
EmailPDF sent
Month-endAccount statement
EmailBalance sent
Payment inReceipt REC-2207
EmailReceipt sent
Credit noteACN-0091
EmailNote sent
Illustrative · every email carries the same document you raised
02 — Payment Follow-up

The nudge goes out on time —
every overdue account

Following up on overdue payments is the job that always slips when the team is busy. Fast Billing drives it off the receivable in payments & follow-up: when an invoice crosses its due date or an outstanding balance ages past a threshold, a WhatsApp, SMS or email reminder goes out automatically — invoice number, amount and days overdue drawn from the ledger. The customer gets a clear, correct nudge on the channel they read, and nobody had to remember to send it.

Overdue reminder fires on the due date
Outstanding reminder past your threshold
Amount and days overdue from the ledger
WhatsApp, SMS or email, your choice
Receivable → follow-up message
Bikree · IN-4712
Due date passed
WhatsApp
7 days overdue
Solidus · ₹1,10,000
Outstanding 30+ days
SMS + Email
Firmer reminder
Priceway · IN-4780
Due in 2 days
WhatsApp
Gentle nudge
Micro India
Paid on reminder
Receipt
Loop closed
Large account
Copy owner
Internal
On escalation
03 — Who Gets What, When

You set the rules once.
The chasing runs itself

Not every account needs the same touch. Fast Billing lets you map each message type to a recipient, a channel and a schedule — the customer gets the invoice and the follow-up, a firmer email replaces the gentle nudge after a week, and an internal owner can be copied on a large overdue account. Set it once and the collections rhythm runs on its own, correct and on time, while your team works the exceptions instead of the whole ledger.

Recipient, channel and schedule per message
Escalate from a nudge to a firmer reminder
Copy an internal owner on big overdue accounts
Team works exceptions, not the whole ledger
Message Rules
Active
Invoice raisedCustomer · immediate
Email
Due dateCustomer · gentle nudge
WhatsApp
Overdue 7 daysCustomer · firmer
Email + SMS
Overdue 30 daysCopy account owner
Internal
Full capability set

Everything WhatsApp, email & SMS cover

Email Invoices & Statements

Tax invoices, account statements and receipts emailed to the customer as PDFs, carrying the same values and GST as the print.

WhatsApp Follow-up

Overdue and outstanding reminders on WhatsApp with the invoice number, amount and days overdue from the ledger.

SMS Reminders

A short SMS reminder for customers who read text before anything else — the same follow-up, on the channel that reaches them.

Receipt Confirmations

A receipt goes out on every recorded payment, confirming the amount and the invoice, so both sides know the loop is closed.

Rules & Scheduling

Each message type maps to a recipient, a channel and a schedule, with escalation from a gentle nudge to a firmer reminder.

Tied to the Ledger

Every message draws its figures from the billing ledger, so the invoice number, amount and due date always match what you billed.

"Following up on overdue invoices was always the thing that slipped when we got busy. Now the invoice emails itself the moment it's raised, and the overdue nudge goes out on WhatsApp on the due date — with the right amount — so the team works the difficult accounts instead of the whole ledger."
AR
Accounts Receivable Lead
Distribution business — Pune
On time
invoices, statements and receipts email themselves, and the overdue nudge fires on the due date — no one has to remember
Your rules
who gets what, on which channel and when — set once, so the collections rhythm runs itself, correct every time

See an invoice email itself
and an overdue nudge fire

In a 30-minute demo we'll raise a tax invoice and email it, take a payment and send the receipt, then watch an overdue reminder go out on WhatsApp — on the rules you set.

Get a demo See pricing
Email invoices, statements & receipts WhatsApp, SMS & email follow-up You set who and when Cloud and on-premise