Authorization Required error while trying to list hotels.

Question

I'm affiliate to booking.com then I want to use Booking API docs here.

The request which I'm using is this:

GET https://distribution-xml.booking.com/2.0/json/hotels?hotel_ids=10004

I have used basic authentication in my request headers

But I am getting this error :

{
    "errors": [
        {
            "message": "Authorization Required",
            "code": 401,
            "ruid": "UmFuZG9tSVYkc2RlIyh9YVhcDYJlWOcAkxMZH+1jcquI5Z7fv6LDYaceuj3AdKd3VDgwdChn5akQBxBnXalRCXWo+sYnzuopS7/bBrZXsHI="
        }
    ]
}