How to pass Header into REST Service SMO.

Hello all,

I have a dll, for K2 REST Service, with the input parameters below.

How do I pass the Header into the REST Service call, using the REST service SMO below.

I need to do this for a GET http method.

The base url is: 

http://45.77.93.200/api/v1/getBal?accno=2003738332&datefrom=*personal details removed*

Header is:

x-access-token: e6738hheyy8ye7833939eye78ee78f9h4803hhf79393nviv003j3j.89303jjf9003jjd903088fh8s9s90303

Thank you all.