Developed and delivered a Redsys payment integration for the juspay/hyperswitch repository, enabling manual capture and providing an option to disable 3DS authentication for merchants. This configuration-driven approach allowed merchants to control capture timing and reduce checkout friction, enhancing flexibility in payment workflows. Collaborated across teams to co-author and stabilize Cypress continuous integration tests, specifically addressing reliability issues with the Redsys workflow. Leveraged JavaScript and Cypress to implement and test these features, focusing on robust payment integration and automated testing. The work improved CI reliability and offered merchants greater control, supporting smoother user experiences and potential increases in conversion rates.