Returning Oauth token with REST API via PHP arrays when trying to send new contacts

In the salesforce REST API documentation, it tells how the system can give Oauth Tokens (https://code.exacttarget.com/apis-sdks/rest-api/v1/auth/requestToken.html ) But I don't see any documentation on how your system receives Oauth tokens when sending data.

I'm fairly new at combining OAuth with REST API, and so this is screwing with me a bit.

This code successfully gives me a token:

$exactTarget = 'https://auth.exacttargetapis.com/v1/requestToken';
$OAUTHarray = array('clientId' => 'SomethingGoesHere', 'clientSecret' => 'sshhhNowThatisASecret');

$options = array(
        'http' => array(
                'method'  => 'POST',
                'content' => json_encode( $OAUTHarray ),
                'header'=>  "Content-Type: application/json\r\n" .
                "Accept: application/json\r\n"
        )
);

$context  = stream_context_create( $options );
$result = file_get_contents( $exactTarget, false, $context );
$response = json_decode( $result );

I've outputted the data to make sure I was getting a valid token (and I was.) However, when trying to actually run commands, I can't get the tokens accepted.

This is my current follow-up code:

$exactTarget = 'https://www.exacttargetapis.com/contacts/v1/contacts';
$values = array ('name' => '' . $name, 'value' => '' . $email);
$items = array ('values' => $values);
$attributeSet = array ('items' => $items);
$dataset01 = array('contactKey' => '' . $email, 'contactId' => null, 'attributeSets' => $attributeSet);

$valuesArray = array($lastname, $firstname);
$itemsArray = array('values' => $valuesArray);
$dataset02 = array('name' => 'Email Democgraphics', 'items' => $itemsArray);
$finalData = array($dataset01, $dataset02);

if ($debug == true){
    echo "<script>alert(" . $response->{"accessToken"} . ")</script>";
}

$options = array(
        'http' => array(
                'method'  => 'POST',
                'content' => json_encode( $finalData ),
                'header'=>  "Content-Type: application/json\r\n" .
                "Accept: application/json\r\n" .
                "Authorization: Bearer " . $response->{"accessToken"} . "\r\n"
                
        )
        
);

$context  = stream_context_create( $options );
$result = file_get_contents( $exactTarget, false, $context );
$response2 = json_decode( $result );

So, what's wrong here, or what needs to be added?