"arguments": {
    "execute": {
        "inArguments": {
            "email":"{{Contact.Default.Email}}",
            "first_name":"{{Contact.Attribute.['Email Demographics'].['First Name']}}",
            "last_name":"{{Contact.Attribute.['Email Demographics'].['Last Name']}}"
        },
        "outArguments": {},
        "url": "https://my-public-server/create_lead/execute",
        "verb": "POST",
        "body": "",
        "header": "https://my-public-server/create_lead/execute",
        "format": "json",
        "useJwt": false,
        "timeout": 10000
    }
},