Writer 1 / Study Program : Fitria Dwi Cahya / Information System Writer 2 / Study Program : Syifa Afra Kamila Mumtaz / Information System Title : Re-enginering Webshop into Product Line Application with PRICES-IDE Counselor : Dr. Maya Retno Ayu Setyautami, M.Kom Webshop enables the buying and selling of products or services directly over the internet. While each webshop shares common features, unique variations set them apart. This study aims to develop a Webshop Product Line using the Software Product Line Engineering (SPLE) paradigm with the support of the Precise Requirement Integrated Changes (PRICES) IDE tool. SPLE is a software development paradigm that enables mass customization by managing commonality and variability within a family of similar software products (product line). PRICES-IDE is a software development tool based on SPLE, utilizing the Delta Oriented Programming (DOP) approach. The development process involved modeling the Interaction Flow Modeling Language with DOP extensions (IFML-DOP) and the Unified Modeling Language with DOP extensions (UML-DOP). This study successfully produced various webshop product variants, which were tested through functional and security testing. The test results demonstrate that PRICES-IDE is effective for developing Webshop Product Lines with customizable feature variants tailored to specific needs.