Get Leads returns "Authtoken support is deprecated"

Hello,

When I send request "Get" https://www.zohoapis.com/crm/v2/Leads/{my_record_id}, API returns me the next response:

{
    "code": "AUTHTOKEN_DEPRECATED",
    "details": {},
    "message": "Authtoken support is deprecated",
    "status": "error"
}

Example: 
Get https://www.zohoapis.com/crm/v2/Leads/123456789

Headers: Content-Type:application/json Authorization:{my_Auth_Key}

Please let me know how to fixed the problem.