01
Install CardShipper
Download the ZIP, unzip it, open chrome://extensions, enable Developer mode, and choose Load unpacked. Select the unzipped extension folder.
Install the extension, then sign in with your CardShipper account.
After checkout, CardShipper is activated by signing into the Chrome extension with the same email. Use the early-access ZIP now; replace it with the Chrome Web Store installer once the listing is live.
02
Sign in
Open the popup and sign in with the same email and password you used on the website account page.
03
Connect EasyPost
Open Settings, save your EasyPost API key and sender address, then preview rates for one order.
Website account sessions cannot be shared directly with a Chrome extension. The account is the same in Supabase, but the extension needs its own sign-in so it can store its session securely in extension storage. When the Chrome Web Store listing is approved, replace the ZIP download with the store install link.