Replace YOUR_MERCHANT_ID with your own Merchant ID, which you received during registration. If you aren't sure what your Merchant ID is, check your Merchant ID by signing in to Seller Central and going to Integration > MWS Access Key.
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PwA - Specifies the Amazon Pay button.
profile:user_id Gives access only to the userID from the user profile after login.
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We also recommend that you implement an onError handler in your code. The onError code is optional, but it can save you considerable effort with troubleshooting integration issues. For more information, see Testing your integration in the sandbox environment.
