You must be registered as a Professional Seller and as an Amazon MWS Developer in order to authorize or create apps.
If you decide to use or develop apps for Seller Central, you must have a Professional selling plan and also register as an Amazon MWS developer.
As an Amazon MWS developer, you receive the MWS Auth token which is used for:
Using Amazon tools such as the Amazon Merchant Transport Utility .
Using desktop applications developed by third-party developers.
Using Web applications that you develop.
Sending requests to Amazon MWS for your own seller account.
Sending requests to Amazon MWS on behalf of other sellers.
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