See detailed steps to get your MWS token and Seller ID for North America and EU.
1. On your MySellerPal, go to Amazon Settings and click on Authorize Amazon MWS - North America or Authorize Amazon MWS - EU (whichever is applicable).
2. Click on "Connect Amazon MWS North America" for the US marketplace or "Connect Amazon MWS EU" for the EU marketplace.
3. Click on the radio button then click "Next".
4. Click "Continue".