I am developing a web app which will be pulling data from Amazon Advertising API. I need as a user to see data for all of the sellers that has approved/registered for using their profile's data.
Is this scenario possible? If not, is there anything similar to it? If yes, how do I implement it, is there some documentation?
The Amazon Advertising API v2 was released late 2018, so it's pretty new but has some missing information in the official documentation. But to get started please follow the official documentation guide:
https://advertising.amazon.com/API/docs/v2/guides/get_started
A lot of other sources are outdated, so I suggest to stick to this guide.
The logic to handle multiple Amazon Seller Accounts you have to handle yourself. But every Seller Account has to go through the consent workflow to give your console app the rights to get access to the shop data via API. Therefore you need to implement a 'Login with Amazon' button - That's the part that is not mentioned in the documentation. See https://login.amazon.com/