
in the upper right corner of the screen, Settings > User Permissions, then under the text 'Amazon MWS Developer Access Keys' press the button 'Visit Developer Credentials'. Once logged in to your paid seller account. It appears there truly is no free nor less expensive option, and that Amazon simply does double-dip and charge both the actual seller and the developer just to use MWS at all.

There are multiple discussions on the amazon sellers forum about this.
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7 I have signed up for MWS with Professional plan but it requires $39.99 per month payment (even for development)? Any idea if I can get a free trial or a free developer account?.joshubrown : On signing up for mws, I got only merchant ID, Marketplace ID, AWS Access Key ID, Secret Key But no developer account number.a UK seller can authorize a French Amazon account.) In the case of Europe, a European account can authorize any other European account (e.g. Note that this will only work for vendors on the American version of Amazon - if your client is selling on one of the localized Amazon sites like Amazon.ca, then you will need a developer ID and seller account from the localized sites. If you don't already have one, you can sign up here:

You will need to have a seller account on the 'Professional' plan or higher. You can find your developer ID using the 'Sign up for MWS' wizard located here:
