You price a quote on Monday. The customer says yes on Tuesday. You deliver or you turn up on Wednesday, and the invoice has to follow that same evening. COMZA carries the same lines through every step and tells you, at any moment, who still owes you money.
You pick the customer and you type your lines: twelve cans, five workshop hours, a session. The number, your details and the three totals are already in place.
14, rue du Marché Central
Quartier des Halles
Tax ID TX-4471-093
Phone +00 555 01 42 18
Issued on 30/09/2026
Due on 30/10/2026
Quincaillerie du Pont — Mr Idriss Wahé
8, avenue des Trois Puits
Customer account CL-0207
| Description | Qty | Price | Amount |
|---|---|---|---|
| White acrylic paint 25 L can, 0,88 $ per litre |
12 | 22,00 | 264,00 |
| 15W40 engine oil carton of 6 × 1 L, 1,60 $ per litre |
8 | 9,60 | 76,80 |
| Fitting labour workshop hour, 7,45 $ per hour |
5 | 7,45 | 37,25 |
A percentage field. A discount is written −15,00 $, on the quote as on the invoice, and the customer reads the same figure as you.
The quote becomes an order confirmation, then a delivery note, then an invoice. The credit note comes behind when something comes back. Each document picks up the lines of the one before.
Under each document, what it does to stock.
A price written before the customer commits: twelve cans, five hours of fitting, a callout rate. It goes out as a PDF and holds for 15 days, or the number of days you set.
Stock: nothing movesThe customer said yes on the phone. You press once and the quote becomes an order: same lines, same total of 363,05 $.
Stock: goods reservedThe goods leave, or the repair is done. The customer signs on the phone screen. If only 8 cans arrive out of 12, you note it line by line.
Stock: really outThe amount due and the date you expect it. It keeps its number forever and stays attached to the delivery note.
Stock: already outThree cans returned, a session cancelled the day before, a price typed wrong. The credit note corrects without erasing anything: the original invoice stays readable years later.
Stock: back on the shelfA practice issues an invoice only. A wholesaler uses all five documents. COMZA shows only the ones for your trade and leaves the others put away.
See the 18 tradesAt the counter, the five stages take under fifteen seconds. By transfer, you tick the payment off the next morning and the invoice state moves on its own.
The fourth stage only exists if a rule calls for it.
At the counter, in the workshop, in the booth or from a phone at the roadside. The lines, the quantities, the discount as an amount.
Cash, transfer, cheque, card, mobile payment. Or two together: 200,00 $ by transfer and 163,05 $ in cash.
The mobile payment transaction number, the transfer reference, a photo of a crumpled receipt. The document stays stuck to the payment.
A discount above the cap, a sale on credit, cancelling a receipt. He answers from his phone in a minute, and his name stays written with the time.
Paid, part paid, unpaid. You read the state in the list, without opening a single document.
The sums received cover the 363,05 $. The invoice leaves the watch list.
The customer has paid 200,00 $ of 363,05 $. There is 163,05 $ left on the clock.
The due date of 30/10/2026 has passed and nothing has come in. The invoice moves into arrears on its own.
The record fills up as the sales go by, without you having to keep it in the evening. At the counter, the walk-in customer stays the default setting: most people pay and leave.
Two fields are enough to create the record, the day the passer-by becomes a regular.
Seven invoices overdue, 980,00 $ outstanding. The list files them from oldest to most recent and tells you what to do with each.
Every invoice past its due date, the oldest at the top. You read it on your phone, at 9 pm, without turning the computer on.
Eight days late and four months late are not handled the same way. The amounts are filed by band.
The message is ready: the customer's name, number FA-2026-0128, the 363,05 $, the 12 days late. You read it over, you send it.
Every overdue reminder stays on file: who sent it, which day, and how many went before it.
Cap passed, the register sells no more on credit to that customer. The manager lifts the block from his phone if he thinks it right.
The debt stops growing during the three weeks your head is elsewhere.
The same book, supplier and subcontractor side: their prices, your purchase orders, and what is left to pay them this month.
The price of the last purchase, and the one before. Two suppliers sell you the same 25 L can: one has stayed at 22,00 $, the other has gone up to 24,50 $ this month.
You enter the price of the container — a can, a carton, a pallet; the price per litre or per unit works itself out behind.
You prepare, you send, you tick off what arrives on the dock. 4 cans missing out of 12? You note it line by line, in front of the driver.
Stock goes up by what was delivered, never by what was ordered.
The unpaid purchase invoices, with their due dates. Monday morning, you know what falls due before Sunday.
Every payment carries its means of payment and its proof.
The rules are not the same from one country to the next. Four requirements come back almost everywhere, and COMZA applies them without you having to think about it.
Company name, address, tax ID, phone, issue date, due date. On all five documents, not only on the invoice.
From 0001 to 0128, no number is missing. An invoice once issued is not erased; a credit note corrects it and stays attached to it.
The document comes out in your currency and in your customer's language, among the 15 COMZA speaks.
You enter the rate in force where you are, or you leave it at 0,00 $. The calculation follows, line by line.
Three years of invoices come out as one PDF and one spreadsheet, over the period you choose. The day you stop, you take the 128 documents with you.
See the exportsFour questions at sign-up, your details typed once, and FA-2026-0001 reaches your customer within the hour. 14 days free, charged only on day 15.