Need help for correct content

hey so I have been trying to figure out how to get this to work but I need help and hopefully someone can help me, I am trying to make an app config and a few apps have this layout for the content / post data but I am not sure what I am doing wrong as it keeps coming back as bad request, I edited it and put in the correct input for user and pass, let me know how to get this to work and what I am doing wrong.

Content which is not working: {“operationName”:“LoginScreenMutation”,“variables”:{“input”:{“brandId”:“1”,“psw”:“<input.PASS>”,“username”:“<input.USER>”}},“query”:“mutation LoginScreenMutation($input: MemberLoginMutationInput) {\n memberLogin(input: $input) {\n token\n viewer {\n id\n firstName\n barcode\n barcodeInline\n memberNumber\n email\n internalTester\n isVerified\n __typename\n }\n __typename\n }\n}\n”}


read this thread.

just remove \n in the post data