API bookings/v1/json/appointment not adding additional fields he is returning this "customer_more_info": {"booking_form_type": "service"}

API bookings/v1/json/appointment not adding additional fields he is returning this "customer_more_info": {"booking_form_type": "service"}

Hi, I'm trying to add additional fields inside zoho booking appointment api and I'm passing same data as you told inside your documentation. He is returning following response 
"customer_more_info": {
                "booking_form_type""service"
 }
I'm using this parameter for add additional field additional_fields


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