How to call integration with post method in expression rule

A Score Level 1

Hi 

I have integration with post method,

I'm getting success response with token in body  but I need to call this integration in Expression rule and fetch the token field and pass that token into remaining API's. 

->I have tried to call in expression rule but getting output as "Smart Service".

How to call the post method integration in expression rule. can anyone suggest on this issue.

Regards,

Devi.

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