Get List of Acceptable Import Fields

{
    "data": [
        {
            "field": "phone",
            "label": "Phone"
        },
        {
            "field": "first_name",
            "label": "First Name"
        },
        {
            "field": "last_name",
            "label": "Last Name"
        },
        {
            "field": "custom1",
            "label": "Custom String 1"
        },
        {
            "field": "custom2",
            "label": "Custom String 2"
        },
        {
            "field": "custom3",
            "label": "Custom String 3"
        },
        {
            "field": "custom4",
            "label": "Custom String 4"
        },
        {
            "field": "fax_number",
            "label": "Fax Number"
        },
        {
            "field": "organization_name",
            "label": "Organization Name"
        },
        {
            "field": "email",
            "label": "Email"
        },
        {
            "field": "address_line_1",
            "label": "Address Line 1"
        },
        {
            "field": "address_line_2",
            "label": "Address Line 2"
        },
        {
            "field": "address_city",
            "label": "City"
        },
        {
            "field": "address_state",
            "label": "State"
        },
        {
            "field": "address_postal_code",
            "label": "Postal Code"
        },
        {
            "field": "address_country",
            "label": "Country"
        }
    ],
    "http_code": 200,
    "response_code": "SUCCESS",
    "response_msg": "List of acceptable import fields."
}