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Step 1: Log in to the Prep Center portal Log in to the Prep Center portal and click your profile picture in the top right. Select “Your Profile” and then the “Api” tab. Step 2: Create an API token Under “Create API Token”, enter a Token Name (e.g. ArbitrageOne) and click “Create”. Step 3: Copy and paste the API key → Open directly in the app: app.arbitrageone.de/marketplace A pop-up window appears. Click “Copy To Clipboard”, then paste the API key into ArbitrageOne under “API Token”. Step 4: Copy and paste your Merchant ID Go back to the Prep Center portal and close the pop-up. Next, copy your Merchant ID — you’ll find it at the top inside the blue info box (click the copy icon next to the number) — and paste it into ArbitrageOne. Step 5: Add a shipping address → Open directly in the app: app.arbitrageone.de/shippingaddresses After successfully adding the Prep Center API, add or edit a shipping address in ArbitrageOne under Settings. Enable the toggle “This is a Prep Center” and select the correct entry under “Prep Center API”.