WOPA

What is WOPA?

WOPA is a WhatsApp-based invoicing assistant for UK tradespeople. It lets users create invoice PDFs from a chat message, send the invoice by email, and manage payment follow-up from the same WhatsApp conversation.

The product is designed to reduce the amount of admin involved in invoicing after a job is done. Users describe the job, customer, and amount in plain English, then review a draft before sending. WOPA also tracks unpaid invoices and can send polite reminders on a schedule until the invoice is marked paid.

WOPA currently focuses on invoicing workflow rather than full accounting. It supports invoice details such as VAT, CIS, and construction reverse charge fields, and it offers 3 free invoices per month with no credit card required to start.

Key Features

• Create invoice drafts from plain-English WhatsApp messages, which reduces the need to enter data into a separate app or spreadsheet.
• Preview and approve invoices before they are sent, so the customer, amount, due date, and bank details can be checked first.
• Email PDF invoices directly to customers from WhatsApp, giving recipients a professional invoice format with payment details.
• Track unpaid invoices and ask questions like “who hasn’t paid?” to see outstanding balances and late payments.
• Send automated reminder follow-ups on a 7, 14, and 28 day schedule, with the option to pause, mark paid, or switch reminders off.
• Support VAT, CIS, and construction reverse charge fields, which makes it usable for some UK trade invoicing scenarios.
• Offer a WhatsApp-only workflow with no app to download, plus desktop access via QR scan.

How to Use WOPA

Start by opening WhatsApp and messaging WOPA with the job details, customer name, and invoice amount. WOPA creates a draft and asks for anything missing.

Review the draft invoice, confirm the details, and reply to send it. After the invoice goes out by email, WOPA continues tracking payment status and can send reminders automatically until the invoice is paid or stopped.

Use Cases

• A sole trader who wants to create and send an invoice immediately after finishing a job, without switching to accounting software.
• A tradesperson who needs to follow up on overdue invoices and wants a simple way to see which customers still owe money.
• A small limited company that prefers to keep invoicing in WhatsApp while still emailing customers a PDF invoice with bank details.
• An electrician, plumber, builder, or similar trade that needs invoice fields for VAT, CIS, or construction reverse charge work.
• A user who wants to mark an invoice as paid from chat so automatic reminders stop without needing a separate dashboard.

FAQ

Does WOPA require a separate app?
No. The product is designed to work inside WhatsApp, and the page says there is no app to download.

Can I try it before paying?
Yes. The page says you can start free with 3 invoices per month and no credit card is needed.

How are invoices sent to customers?
WOPA sends a PDF invoice by email from within the WhatsApp workflow.

Can WOPA chase unpaid invoices automatically?
Yes. The page describes reminder follow-ups at 7, 14, and 28 days, with the ability to pause or stop them when an invoice is paid.

Is WOPA fully Making Tax Digital compatible?
Not yet. The page says WOPA is building MTD-ready workflows and researching HMRC requirements, but it also states that it is not currently HMRC-recognised or MTD-compatible software.

Alternatives

• Traditional invoicing software such as Xero, QuickBooks, or similar accounting tools. These usually offer broader bookkeeping features, but they require users to work in a dedicated app or web dashboard rather than WhatsApp.
• General email-based invoice templates or PDF generators. These can create invoices, but they do not provide the same chat-based drafting or automated reminder flow described for WOPA.
• Spreadsheets plus manual reminders. This approach can be flexible and inexpensive, but it depends on the user to build, send, and chase invoices themselves.
• Other messaging-based business assistants, if available. These may also reduce app switching, but they will differ in whether they focus on invoicing, reminders, accounting, or broader business tasks.