Find the answer to your question
What are User Tokens and how are they associated with eBay Users and their applications?
A User token represents an authorization for an application to access eBay data (via eBay APIs) on behalf of an eBay user. An eBay user grants an application a user token by giving consent via the eBay sign-in and consent form. For more details on the process of creation of a user token refer 'Steps to generate a new and renew user token' .
A unique user token is created for every eBay user-application combination.To put it in simple words, if an eBay user owns multiple applications, each will need to use its own user token to access eBay data on the user's behalf.
Below are some illustrative use cases to explain this better.
One thing to keep in mind while going thru these illustrations is that there are 2 entities involved in creation of a unique user token - an Application (for simplicity's sake lets assume that its being maintained by a single Developer) and a customer or eBay User.
Assume there are three developers who are all members the eBay developer network and there are three different eBay users -
Each developer owns a keyset, which comprises of 3 keys: a Dev Id, an AppId and a Cert Id. In the following illustrations, lets assume our developers have the following keysets:
So, lets start with the simplest of our use cases -