# Why Sunday decided to use Invopop

> Why Sunday chose Invopop over Stripe and Chargebee to keep billing in-house, and how it now issues 3,000+ invoices a month across five countries.

Type: Customer story
Customer: Sunday
Sector: SaaS
Interviewee: Jean-Baptiste Rieu, Senior Product Manager
Countries: france, italy, germany, united-kingdom, united-states
Published: 2025-04-10T15:22:53.000Z

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## In short

Sunday kept its own billing system and put Invopop behind it. PDF invoices now go out in four countries, Italy's e-invoicing format was met within weeks of opening there, and a country Invopop did not yet cover took a week to add.

- Integrated Invopop with Sunday's in-house billing with no major changes
- PDF invoices issued in France, Germany, the UK and the United States
- Opened in Italy and complied with the local e-invoice format within weeks

## Results

| Metric | Value |
|---|---|
| Countries | 5 |
| Monthly invoices | +3k |
| Weeks of integration work | <3 |

Sunday, a payment solution for restaurants serving over 4,000 customers across five countries, sought an API to issue invoices in different countries as their transaction volumes scaled. Although they considered solutions like Stripe and Chargebee, they preferred to keep billing in-house and thus looked for a modular API invoicing solution.

> We requested support for Germany when Invopop didn't have it. They launched it in a week
>
> — Jean-Baptiste Rieu, Senior Product Manager

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## Source

- Canonical page (human): https://www.invopop.com/customers/sunday
- This document (markdown): https://www.invopop.com/customers/sunday.md
- Site index for LLMs: https://www.invopop.com/llms.txt
- All customer stories: https://www.invopop.com/customers