The checkout process is one of the most business-critical elements of any e-commerce platform, as even minor errors can directly lead to lost revenue and reduced customer trust. In this project, the PlentySHOP checkout for the client Elegant Einrichten was thoroughly reviewed, analyzed, and optimized to eliminate both visible, user-side issues and hidden technical errors.
Particular attention was paid to PayPal Express Checkout, which previously led to inconsistent user experiences (e.g., 404 errors after login, faulty cookie banners, and incomplete payment processing). Furthermore, guest checkout occasionally failed with cryptic error messages, which could deter customers from completing their orders.