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Here is my WIP for the issue.
As mentioned, in this code I am trying to set up a simple example of ERC7498 exchange.
After deploying two ERC721 redeemable mintable contracts (the second one being for receiving), I created instances of offer, consideration, and trait (which I left empty).
With this setup, I created a campaign and then minted two tokens for user1 and one for user2.
I then tried to simulate an exchange request from user2 (who possesses the token requested by the campaign) but I am facing errors related to insufficient balance or invalid caller.