Expired timestamp, yours 1544170500, ours 1544749978
<hr />
OAuthRequest Object
(
    [parameters:OAuthRequest:private] => Array
        (
            [oauth_version] => 1.0
            [oauth_nonce] => d8c736004ff4b665e7b1e5f8d2a5f3d7
            [oauth_timestamp] => 1544170500
            [oauth_consumer_key] => key
            [method] => foo%20bar
            [bar] => baz
            [oauth_token] => accesskey
            [oauth_signature_method] => PLAINTEXT
            [oauth_signature] => secret%26accesssecret
        )

    [http_method:OAuthRequest:private] => GET
    [http_url:OAuthRequest:private] => http://term.ie/oauth/example/echo_api.php?oauth_version=1.0&oauth_nonce=d8c736004ff4b665e7b1e5f8d2a5f3d7&oauth_timestamp=1544170500&oauth_consumer_key=key&method=foo%2520bar&bar=baz&oauth_token=accesskey&oauth_signature_method=PLAINTEXT&oauth_signature=secret%2526accesssecret
    [base_string] => 
)