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Year of collaboration

2020 – 2022


One of the fastest-growing fintech companies in Europe

Unzer was founded in 2003 and has since offered groundbreaking innovations in online payment solutions and transaction management. The company supports customers worldwide with scalable solutions for online marketplaces. Unzer helps other companies grow by delivering secure payment methods, such as credit and debit card payments, wallets, direct transfers, and prepayments.


Design a progressive development portal for Unzer

Unzer needed a brand new solution for keeping their API documentation portal uniform, up-to-date, and in line with best practices for writing technical documentation. Their documentation tool had to be either substantially enhanced or changed in order to suit their needs. In addition, Unzer needed to align their documentation process with the product development cycles, and automatically generate API docs using OpenAPI.

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Finding a contemporary technical solution for documenting the Unzer API and migrating live content

Unzer was using, an out-of-the-box solution for developer documentation, and ReadMe-flavoured Markdown, a proprietary authoring format. Because of this, full customisation of the documentation portal wasn’t possibile.

The documentation in use was often outdated, so numerous updates and improvements were required. At the same time, Unzer was undergoing rebranding, and the branding changes had to be reflected in the portal layout too.

Unzer’s team needed to learn how to document the Unzer API themselves, without external help in the long term.


3di found a better technical solution for the Unzer API documentation

The 3di team:

  • Designed a content plan and defined the structure for the entire documentation set.
  • Refined the structure and content of the existing documentation.
  • Designed UX wireframes of the new portal features.
  • Built the new documentation portal with Hugo, a static site generator, instead of
  • Migrated the existing ReadMe-flavoured documentation to CommonMark with a number of standard extensions.
  • Designed a new documentation process and technical workflow to complement Unzer’s development cycles.
  • Set up a continuous integration and delivery (CI/CD) in GitLab, deploying Unzer’s own infrastructure.
  • Set up an authoring environment in Visual Studio Code (VSCode), with extensions and customisations tailored to the CommonMark format.
  • Documented both the technical solution and the technical writing process for Unzer developers.
  • Customised Unzer’s corporate graphic design layout and applied it to the documentation portal.

See our work


3di helped Unzer regain control of the technical documentation, improved the Unzer API documentation, and simplified the process of updating content

The 3di team:

  • Deployed a brand-new documentation portal using cutting-edge technology.
  • Made Unzer’s documentation well-structured and concise.
  • Made it easy for Unzer developers to create and update documentation, and publish their changes.
  • Provided practical guidelines for Unzer’s staff to follow when creating and updating documentation.
  • Organized and ran training sessions for Unzer’s technical authors on creating and updating documentation.
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