REST API Call with formData Parameter

Parameter            Value                                   Parameter Type           Data Type

access-token               header                           string

userid                          header                           string

apikey                         query                             string

filename                    formData                         string

filedata       formData                         file

Hello everyone,

We are trying to call a REST API (type POST) via Appian and it requires two parameters to be passed as formData type.
Any ideas or suggestions on how to use this API. As of now, the smart service HTTP Query allows us to pass the header and query parameters, but none of type formData.
Would appreciate your input.