# 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
Countries: france, italy, germany, united-kingdom, united-states
Published: 2025-04-10T15:22:53.000Z

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## About Sunday

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.

## 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.

## What they achieved

- Integrated Invopop with Sunday's in-house billing with no major changes
- Use Invopop to issue PDF invoices in France, Germany, UK, & US
- Sunday opened in Italy and was able to comply with the local e-invoice format in weeks

> 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