Need Contact Name and Email from Commerce Order

Im having trouble extracting the Name and Email of a contact from a commerce order. ( I need this to email the contact)

I see a fetch contact from Zoho CRM - Fetch contact but I can't figure out where to extract the contact_person_id to pass in?

"contact_person_details": [

{

"phone": #########,

"mobile": "",

"last_name": "LName",

"contact_person_id": ###################,

"first_name": "FName",

}

]