Case studies

Rebuilding complex payment forms and their integrations in no time

About Opositatest

Opositatest is an online platform that offers study guides to help students pass public examinations and become public workers. By registering in, users can access quality content and tests to successfully pass any public examination.

With more than 350,000 users (and counting), Opositatest is now planning to expand its business across the EU, and beyond. Their business model is based on user registration as well as a subscription model, with premium content for personalized practice time.

The challenge

The challenge: How to build a payment flow in a rush

Right before the international launching of one of their projects, Opositatest needed a completely new payment process for their subscription models.

The requirements? Being a payment form, it was imperative that their new system ensured the highest level of security. On the other side, it was also necessary to connect to different third-party APIs and rebuild the whole flow.

All of this needed to be implemented in a couple of months. Coding it from scratch was not an option. Luckily, Arengu is a much faster solution.

"Arengu is a quick, trustworthy and flexible solution that allowed us to launch faster in new international markets and keep our focus in our core platform."
Borja Maceira
CTO, Opositatest

The solution

The solution: A low-code solution across teams

Arengu offered a solution that worked both for the marketing team and the development team. In a context where both teams needed to work with the tool, it helps developers save time and marketers create limitless flows.

Apart from offering a unique solution that worked across teams, Arengu allowed implementation at a lightning fast speed.

Key points

Key points

  • Powerful integrations. Opositatest needed a complex new payment flow that required external connections via APIs. With Arengu, they were able to keep all of them in a single boilerplate.
  • Verified payments. Security first. In order to verify every payment, this new flow includes a two-factor verification process with a one-time password sent via email.
  • Speedy implementation. When time is running short, Arengu is a quick and trustworthy solution. Complex flows can be created in no time, while ensuring the best of the performances.
  • Solution across teams. Arengu helps different teams save time. Developers can implement a solution in no time, while marketers can create new flows without coding skills.

Getting started with Arengu

Arengu allows you to build all your user flows connected to your current stack, and avoids coding all the UI, complex integrations, validations or logic from scratch. Try it for free and start building faster and scaling your application needs as they grow.