No Reponse header - Need Json

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My question:
How do I make my response header request display in JSON? Currently the 3rd party I am trying to connect to says that it is still returning text and when I look at the server I says I don’t have a header?

Details (like screenshots):


How I found the problem:

‘https://e714a6f8-44cd-409e-ae5d-f34484b6a378.mock.pstmn.io/api/paymentid’

I’ve already tried:
Changing the setting to JSON