Redesign of Mollie's KYC and API Integration
Yves Dukker
Improving the API integration and onboarding journey for new users
Mollie is one of Europe’s leading Payment Service Providers (PSP), offering businesses a range of payment solutions, including online payment systems for websites, in-person payment terminals, and financial tools. This project focused on improving the user experience for new customers, especially in the onboarding process.
Results
I led the redesign of Mollie's KYC (Know Your Customer) experience and the API integration feature, simplifying the connection of websites and e-commerce platforms with Mollie’s services.
The redesign was launched across all markets and resulted in average improved click-through (+366%) and conversion rates (+5.4%).
To execute the improvements, we focused on three critical areas:
A/B Testing
An A/B test was conducted to compare the new experience with the previous one. This allowed us to gauge the effectiveness of the redesigned onboarding flow and API integration.
Our Findings
The results of the experiment were promising, we saw:
Key learnings
From this project, several important takeaways emerged:
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Posted Aug 6, 2025
The redesign was launched across global markets and resulted in average improved click-through (+366%) and conversion rates (+5.4%).
