Final integration steps
To complete your integration with Amazon Pay and Login with Amazon, you will need several keys and IDs, including your Merchant ID. You can find these keys and IDs in Seller Central (Click the Integration menu, and then click MWS Keys).
You can enter URLs for Instant payment notifications (IPNs) on the Integration settings page (in the upper right corner, click the Settings menu, and then click Integration settings). If you enter 2 URLs, the notifications will be sent to both of them. Note that the IPN URLs must be set for both the Sandbox and Production environments.
Also on the Integration settings page, you can provide a Banner image that will be used in the login pop-up if you are using Amazon Pay without the Login with Amazon service. (If you are using Login with Amazon, you can ignore the Banner settings.) Information about the format and size of the image is included on the page.
Secure your account with two-step verification
Seller Central requires that you add security to your account by setting up two-step verification, also known as multi-factor authentication (MFA). For instructions, see Turning on Two-Step Verification on the Amazon website.
If you require assistance at any time during the registration and integration process, the Amazon Pay merchant support team is ready to help. Please contact us with your questions.