Here is a https curl request, however the POSTMAN didn’t import the data-binary.
The data is from https://stackoverflow.com/questions/51145193/how-to-convert-curl-data-binary-to-python-request.
curl 'https://example.com/submit' \
-H 'Accept: */*' \
-H 'Referer: http://www.example.com/go/' \
-H 'Origin: http://www.example.com' \
-H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36' \
-H 'Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryFkQeCsmEXjVI5SJ0' \
--data-binary
```------WebKitFormBoundaryFkQeCsmEXjVI5SJ0\r\nContent-Disposition: form-data; name="firstName"\r\n\r\Oleg\r\n------WebKitFormBoundaryFkQeCsmEXjVI5SJ0\r\nContent-Disposition: form-data; name="campaignCode"\r\n\r\n\r\n------WebKitFormBoundaryFkQeCsmEXjVI5SJ0\r\nContent-Disposition: form-data; name="validation"\r\n\r\n{"firstName":"required"}\r\n------WebKitFormBoundaryFkQeCsmEXjVI5SJ0--\r\n' \
--compressed