Иди сюда, чтобы получить токен,
<?php
$t = '{"access_token":"OeB89uEWZZzLPLMIsVBvJtIlnObM1sX7NNNWqwtjdzI.8LlxO2skN028HmcMw8F_BDiqEj9kDRfdVWc9f02WmiY","expires_in":43199,"scope":"","token_type":"bearer"}';
$a = json_decode($t);
print_r($a->access_token);
?>
выход
OeB89uEWZZzLPLMIsVBvJtIlnObM1sX7NNNWqwtjdzI.8LlxO2skN028HmcMw8F_BDiqEj9kDRfdVWc9f02WmiY