matchAdvancedOrders

[NoamN]

I'm trying to understand how to work with matchAdvancedOrders.
My scenario is that I want to fulfill, in one atomic transaction, using a smart contract, a listing and a bid (collection offer) of the same NFT. So, I'm not the owner of this NFT, and I want to fulfill the listing and fulfill the bid in one atomic transaction. I understand that I need to use matchAdvancedOrders.
In order to do that, I fetch the fulfillment_data of the listing (works), and I fetch the fulfillment_data of the bid. I'm able to get result for the bid (I need the signature), when I set the original owner's address as the fulfiller address (will that work? Is it the same signature I need?).
Once I have all the data, how am I suppose to construct the matchAdvancedOrders?