WOPAWhatsApp invoicing for UK tradespeople.

Send invoices
and chase
payments
from WhatsApp.

WOPA helps UK tradespeople create invoice PDFs, email customers, schedule reminders, and mark jobs paid without opening accounting software.

Reserve founder pricing See how it works
QR code for the WOPA bot Scan or click to open the current bot link This temporary link stays in place until the WhatsApp number is ready.
Invoice sent £450
Dan, 14 days late
Payment confirmed
9:41 signalWiFi100%
How it works

From job done
to invoice sent.

Message WOPA, approve the draft, and let the invoice go by email while reminders keep running in the background.

01

Just ask WOPA

Send WOPA a message like you would a colleague: "Hey WOPA, invoice Chris £850 for the rewire and email it to him." WOPA turns it into a draft invoice and asks for anything missing.

hey wopa, invoice chris £850 rewire
draft ready
02

Preview and confirm

Review the customer, work, amount, due date, and bank details. Nothing leaves WhatsApp until you approve it.

reply YES to send
or edit amount
03

WOPA emails the PDF from WhatsApp

Your customer gets a proper PDF invoice by email. They do not need WhatsApp to receive or pay it.

sent to chris@example.com
PDF attached
04

Track and chase

Ask what is outstanding, pause reminders, or mark an invoice paid. WOPA stops chasing the moment you say it is settled.

chris paid
reminders stopped
05

Save customers once

"Hey WOPA, save Chris as a customer, chris@example.com." Next time, just say the name.

save chris as customer
chris@example.com saved
06

Set up once, WOPA remembers

"Hey WOPA, here are my business details and all my customers." Trade name, email, and bank details get saved and reused on every invoice.

setup my business details
saved for invoices
Early access

Join early.
Pay less.

Founder pricing for the first 200 waitlist signups. Leave an email, a WhatsApp number, or both. We'll share the plan before you pay, and there is no card required today.

Fill one field or both. Marketing updates are optional.
By submitting, you agree that WOPA can contact you about waitlist access using the details you provide. If we message you on WhatsApp, reply STOP to opt out. See the privacy notice.
Meet WOPA

The apprentice who
never forgets.

WOPA's the polite invoicing assistant in your WhatsApp. He drafts the invoice, sends the PDF by email, and keeps reminders moving without another dashboard to check.

Electricians Plumbers Carpenters Builders Painters & decorators Roofers HVAC Landscapers Sole traders Small limited companies
"Done. Invoice sent." "Dan, 14 days overdue."
Payment chasing

Automatic.
Still under your control.

Once sent, WOPA watches the clock. Friendly reminders can run automatically until the invoice is paid, paused, or switched off.

D0
Sent
PDF emailed with bank details
auto
D7
Nudge 1
Friendly reminder
auto
D14
Nudge 2
Second follow-up
auto
D28
Overdue
Firm notice
auto
D30
Firm follow-up
Review before sending
you confirm
Paid
All reminders cancelled
"dan paid"
In practice

The whole loop,
in WhatsApp.

WOPA / WhatsApp
Invoice Dan £850 for rewire at 42 Albany Rd
Drafting for Dan, £850.00, "rewire at 42 Albany Rd"
Email: dan@example.com, due: 11 Jun 2026
Bank: 12-34-56, 12345678

Send this?
yes
Done. INV-2026-011 sent to dan@example.com
£850.00, rewire, due 11 Jun.
Reminders at 7, 14, 28 days.
who hasn't paid?
You're owed £1,300:
Dan, £850, 3 days
Sarah, £450, 11 days
chase both
Done. Reminder sent to Dan and Sarah.
dan paid
INV-2026-011 marked paid. Reminders stopped.

What WOPA handles

  • Type invoices the way you talk
  • Chase every unpaid client with one message
  • Ask "who hasn't paid?" any time
  • Mark paid from WhatsApp, reminders stop
  • Polite 7, 14, 28 day follow-ups on autopilot

What your clients receive

  • A clean, professional email from your business
  • A4 PDF invoice with bank details and payment reference
  • Polite reminders at 7, 14, and 28 days

WOPA's voice

Says: "Done."   "Sent."   "Got it."   "On it."

Never says: "Hey buddy!", "No worries!!", "Awesome!", "Hop on a quick call."

Clipped. Calm. Polite. Earns trust by being quiet and correct.

Product boundaries

Built for invoicing admin.
Not accounting software.

WOPA helps you draft invoices, send PDFs by email, and follow up from WhatsApp. You stay responsible for checking invoice details, tax treatment, and customer communications before sending.

What WOPA is

A WhatsApp-first assistant for UK tradespeople who want to create invoice PDFs, email customers, track what is outstanding, and mark invoices paid from chat.

What WOPA is not

WOPA is not bookkeeping software, accounting software, a bank, a payment processor, or a debt collection service.

Current beta limits

No VAT invoice support, payment links, open banking, custom sending domains, or automated bank reconciliation yet.

VAT

WOPA should not be used to claim VAT invoice support until that workflow exists. VAT-registered users need to check requirements with their accountant or tax adviser.

Late payment

Late-payment rules depend on the customer, contract, invoice, jurisdiction, and debt size. WOPA can help prepare follow-up text, but you approve it and decide what to send.

General information

Content on this site is general information only. It is not legal, tax, accounting, financial, or debt collection advice.

Trust and support

Your invoice details
need careful handling.

WOPA handles business contact details, customer emails, invoice information, and bank payment details. The product is being built around explicit approval, clear logs, and deletion on request.

Security basics

  • Encrypted HTTPS connections for the public site and API.
  • Access to waitlist and product data limited to people operating WOPA.
  • Confirmation gates before customer-facing invoice emails and firm follow-ups.
  • Retention and deletion handled through the privacy and data processing notices.

Core providers

The public landing page currently uses Cloudflare for hosting and waitlist storage, Resend for confirmation emails, and PostHog for analytics only if analytics cookies are accepted. Chat, database, and AI providers may vary as the product changes.

Email delivery

Invoices are emailed as PDF attachments. If an email fails, WOPA should surface the failure so you can correct the customer address or send the invoice another way.

Getting help

During early access, support is handled by the WOPA team through the same contact route used for onboarding. Urgent production support hours are not yet advertised, so the page avoids promising a fixed response time.

FAQ

Questions before
you join the waitlist.

Do I need to download an app?

No. WOPA lives in your WhatsApp chat, it can create invoices and chase payments for you.

Can I edit before sending?

Yes. WOPA shows a draft and asks for confirmation before an invoice email or firm follow-up is sent.

Can I turn reminders off?

Yes. You can pause or stop reminders for an invoice. Marking an invoice paid also stops future reminders.

Do customers need WhatsApp?

No. Customers receive the invoice by email as a PDF attachment. WhatsApp is for you to control WOPA.

Does WOPA support VAT?

Not yet. Do not use WOPA to claim VAT invoice support until that workflow is available.

Can I use my own email or domain?

Not yet. Custom sending domains are a later roadmap item, so early invoices are sent through WOPA's email setup.

Will customers see WOPA?

Customers receive an invoice email and PDF. The exact sender details may change during early access and will be made clear before you send live invoices.

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