Linkedin token not valid - api

Question

Here is a strange thing I am fighting against.
First of all I am using this simple-linkedinphp lib to perform API calls from my php backend.
I got a user access token from our IOS app which has the following structure:
{"access_token":"lettersAndSymbols","expires_in":5183999}
I store it in a variable called $token.
Then I try to get the user's profile with this token like this:
$linkedin = new \LinkedIn($this->linkedin_config);
$linkedin->setResponseFormat($linkedin::_RESPONSE_JSON);
$linkedin->setTokenAccess(array('oauth_token' => $token["access_token"], 'oauth_token_secret' => ""));
$linkedinUserJson = $linkedin->profile("~");
Then I get the response with error:
array(5) {
["linkedin"]=>
string(358) "{
"errorCode": 0,
"message": "[unauthorized]. The token used in the OAuth request is not valid. sameLettersAndSymbols",
"requestId": "74T6SY6ML6",
"status": 401,
"timestamp": 1376043937705
}
But when I try to open an api url in a browser with the same LettersAndSymbols like https://api.linkedin.com/v1/people/~?oauth2_access_token=LettersAndSymbols, I get the correct response with user object.
How can that be? Am I doing something wrong with the API lib?

Answer 1

I can see a problem in this line
$linkedin->setTokenAccess(array('oauth_token' => $token["access_token"], 'oauth_token_secret' => ""));
your must provide a secret to set the token access.
I found a nice example about Linkedin Integration, wich I like to share with you, I tested and it works just fine.
How to Integrate login with LinkedIn oAuth in PHP