Xero AccessToken problem

xero

Sign params:

Array
(
    [parameters] => Array
        (
            [oauth_consumer_key] => xxxxxxx
            [oauth_nonce] => VgBkN
            [oauth_signature_method] => HMAC-SHA1
            [oauth_timestamp] => 1385558963
            [oauth_token] => I169SNBI3Y4Q6KLH1AMUYIBX7IQI6X
            [oauth_verifier] => 1663029
            [oauth_version] => 1.0
            [order] => 
            [oauth_signature] => ltUI9bnEc/UvX6x7YrIFLdsQVfo=
        )

    [signature] => ltUI9bnEc%2FUvX6x7YrIFLdsQVfo%3D
    [signed_url] => https://api.xero.com/oauth/AccessToken?oauth_consumer_key=xxxxxx&oauth_nonce=VgBkN&oauth_signature=ltUI9bnEc%2FUvX6x7YrIFLdsQVfo%3D&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1385558963&oauth_token=I169SNBI3Y4Q6KLH1AMUYIBX7IQI6X&oauth_verifier=1663029&oauth_version=1.0&order=
    [header] => OAuth oauth_consumer_key="xxxxxx", oauth_nonce="VgBkN", oauth_signature="ltUI9bnEc%2FUvX6x7YrIFLdsQVfo%3D", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1385558963", oauth_token="I169SNBI3Y4Q6KLH1AMUYIBX7IQI6X", oauth_verifier="1663029", oauth_version="1.0"
    [sbs] => GET&https%3A%2F%2Fapi.xero.com%2Foauth%2FAccessToken&oauth_consumer_key%3Dxxxxxx%26oauth_nonce%3DVgBkN%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1385558963%26oauth_token%3DI169SNBI3Y4Q6KLH1AMUYIBX7IQI6X%26oauth_verifier%3D1663029%26oauth_version%3D1.0%26order%3D
)

cURL HEADER_OUT:

Array
(
    [url] => https://api.xero.com/oauth/AccessToken?oauth_consumer_key=xxxxxx&oauth_nonce=VgBkN&oauth_signature=ltUI9bnEc%2FUvX6x7YrIFLdsQVfo%3D&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1385558963&oauth_token=I169SNBI3Y4Q6KLH1AMUYIBX7IQI6X&oauth_verifier=1663029&oauth_version=1.0&order=
    [content_type] => text/html; charset=utf-8
    [http_code] => 401
    [header_size] => 265
    [request_size] => 434
    [filetime] => -1
    [ssl_verify_result] => 0
    [redirect_count] => 0
    [total_time] => 0.627161
    [namelookup_time] => 0.003233
    [connect_time] => 0.121982
    [pretransfer_time] => 0.486627
    [size_upload] => 0
    [size_download] => 87
    [speed_download] => 138
    [speed_upload] => 0
    [download_content_length] => 87
    [upload_content_length] => 0
    [starttransfer_time] => 0.626985
    [redirect_time] => 0
    [redirect_url] => 
    [request_header] => GET /oauth/AccessToken?oauth_consumer_key=xxxxxx&oauth_nonce=VgBkN&oauth_signature=ltUI9bnEc%2FUvX6x7YrIFLdsQVfo%3D&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1385558963&oauth_token=I169SNBI3Y4Q6KLH1AMUYIBX7IQI6X&oauth_verifier=1663029&oauth_version=1.0&order= HTTP/1.1
User-Agent: Xero-OAuth-PHP Public
Host: api.xero.com
Accept-Encoding: deflate, gzip
Accept: application/xml
Content-Length: 0


)

Response headers:
Array
(
    [headers] => Array
        (
            [cache_control] => private
            [content_type] => text/html; charset=utf-8
            [www_authenticate] => OAuth Realm="213.239.222.20"
            [x_s] => 445761-O1VMAP04
            [strict_transport_security] => max-age=31536000
            [date] => Wed, 27 Nov 2013 13:29:23 GMT
            [content_length] => 87
        )

)