Can’t POST data I’m receiving through a GET method

I’m trying to import data from one magento website to another with Postman’s help. I’m having no problems getting the data from the website 1, however I can’t import it to the other website with the async request. Just so you know, I’ve a GET method where I get the data I want to import to the other website and I run an async request via Tests (POSTMAN) so that the response I get from the GET method, will be what I need to POST.

I keep getting this error:

message:””%fieldName” is required. Enter and try again.” parameters:{} fieldName:”entity”

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The error happens because on the POST method I really need to find a way of insert the fieldname entity like this:

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What should I do?