The Flyp crosslister has very secure, safe and quick way to connect to your online selling accounts. It does not require you to share any sensitive information at all, no passwords or logins are required in order to connect your Poshmark, Mercari, FB Marketplace, or eBay account. When you first open the tool, it will prompt you to install the chrome extension then connect your marketplace accounts. When you're on the "Connect your accounts" page, you can tap "Connect" next to each marketplace and the tool will tell you how to connect the marketplace account you chose. Often, you'll just need to be logged into your account on a different tab, it's that easy!