class Faraday::Parts::ParamPart

def build_part(boundary, name, value)
  part = ''
  part << "--#{boundary}\r\n"
  part << "Content-Disposition: form-data; name=\"#{name.to_s}\";\r\n"
  part << "Content-Type: application/json\r\n"
  part << "\r\n"
  part << "#{value}\r\n"
end