Getting Missing required parameter Error While invoking IS Service in routing

Hi Everyone,

I have created an IS service to send email using smtp. I need to invoke this service in API Gateway. I tried using custom extension in routing policy but getting this error

API Gateway encountered an error. Error Message: [ISS.0086.9160] Missing required parameter: 'body'

I am sending a multipart request. These are my headers from postman

If i try to invoke this service directly and not through API Gateway it works fine but when I try to invoke from API Gateway Routing policy using custom extension I am getting this error.

Any Help would be appreciated.
Thanks

Hello @muhammad.usman22 ,

Can you share the API export , if possible ?

Regards,
Bharath