Request token retrieval failed:

RESPONSE:

Array
(
    [linkedin] => Array
        (
            [oauth_problem] => timestamp_refused
            [oauth_acceptable_timestamps] => 1493416422+-900
        )

    [info] => Array
        (
            [url] => https://api.linkedin.com/uas/oauth/requestToken
            [content_type] => application/x-www-form-urlencoded;charset=UTF-8
            [http_code] => 400
            [header_size] => 686
            [request_size] => 501
            [filetime] => -1
            [ssl_verify_result] => 0
            [redirect_count] => 0
            [total_time] => 0.487997
            [namelookup_time] => 0.124748
            [connect_time] => 0.152751
            [pretransfer_time] => 0.217595
            [size_upload] => 0
            [size_download] => 77
            [speed_download] => 157
            [speed_upload] => 0
            [download_content_length] => 77
            [upload_content_length] => 0
            [starttransfer_time] => 0.487984
            [redirect_time] => 0
            [certinfo] => Array
                (
                )

            [primary_ip] => 2620:109:c007:102::5be1:f884
            [primary_port] => 443
            [local_ip] => 2a01:4f8:c17:112f::2
            [local_port] => 47863
            [redirect_url] => 
        )

    [oauth] => Array
        (
            [header] => Authorization: OAuth realm="http%3A%2F%2Fapi.linkedin.com",oauth_version="1.0",oauth_nonce="bb6ce5073894173628c1c8b976838d25",oauth_timestamp="1493415258",oauth_consumer_key="77pk60nldlxfuu",oauth_callback="http%3A%2F%2Fprojects.tomglobal.org%2Fauth%2Fln_login%3FlType%3Dinitiate%26lResponse%3D1",oauth_signature_method="HMAC-SHA1",oauth_signature="9TzgUsaXKAw6ORYwR3HCMxvLCAA%3D"
            [string] => POST&https%3A%2F%2Fapi.linkedin.com%2Fuas%2Foauth%2FrequestToken&oauth_callback%3Dhttp%253A%252F%252Fprojects.tomglobal.org%252Fauth%252Fln_login%253FlType%253Dinitiate%2526lResponse%253D1%26oauth_consumer_key%3D77pk60nldlxfuu%26oauth_nonce%3Dbb6ce5073894173628c1c8b976838d25%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1493415258%26oauth_version%3D1.0
        )

    [error] => OAuth callback URL was not confirmed by the LinkedIn end-point
    [success] => 
)


LINKEDIN OBJ:

LinkedIn Object
(
    [callback:protected] => http://projects.tomglobal.org/auth/ln_login?lType=initiate&lResponse=1
    [token:protected] => 
    [application_key:protected] => 77pk60nldlxfuu
    [application_secret:protected] => Bq8OY3Rj3ab5MXRX
    [response_format:protected] => xml
    [last_request_headers] => Array
        (
            [0] => Authorization: OAuth realm="http%3A%2F%2Fapi.linkedin.com",oauth_version="1.0",oauth_nonce="bb6ce5073894173628c1c8b976838d25",oauth_timestamp="1493415258",oauth_consumer_key="77pk60nldlxfuu",oauth_callback="http%3A%2F%2Fprojects.tomglobal.org%2Fauth%2Fln_login%3FlType%3Dinitiate%26lResponse%3D1",oauth_signature_method="HMAC-SHA1",oauth_signature="9TzgUsaXKAw6ORYwR3HCMxvLCAA%3D"
            [1] => Content-Type: text/plain; charset=UTF-8
        )

    [last_request_url] => https://api.linkedin.com/uas/oauth/requestToken
)