A recent security breach at Eye4Fraud, a company providing fraud protection for e-commerce merchants, has compromised numerous online shopping accounts, prompting the development of an application that uses Nylas to scan users' emails for interactions with affected vendors. The application, created using Python and Flask, allows users to authorize access to their email inboxes via OAuth, enabling the tool to search for vendor names from a subset of the Eye4Fraud dataset. This breach checker tool informs users if their data might be compromised, allowing them to take protective measures. The guide provides detailed steps for setting up the application, including installing necessary dependencies, configuring the Nylas API, implementing the app’s functionality, and using ngrok for public access. While the tool helps users identify potential breaches, it emphasizes the importance of being vigilant and provides resources for securing compromised accounts, such as enabling multi-factor authentication and recovering hacked accounts.