Hi, As you said Refresh Tokens do not expire the way that Access Tokens do. I got: string(92) "{"error_description":"unknown, invalid, or expired refresh token","error":"invalid_grant"} " My code is: function refreshToken($refreshToken, $clientId, $clientSecret) {
$ch = curl_init();
$base = 'https://idfed.constantcontact.com/as/token.oauth2';
$url = $base . '?refresh_token=' . $refreshToken . '&grant_type=refresh_token';
curl_setopt($ch, CURLOPT_URL, $url);
$auth = $clientId . ':' . $clientSecret;
$credentials = base64_encode($auth);
$authorization = 'Authorization: Basic ' . $credentials;
curl_setopt($ch, CURLOPT_HTTPHEADER, array($authorization));
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
curl_close($ch);
return $result;
}
$refreshToken = "xxxxxx";
$clientId="xxxxxxxx";
$clientSecret="xxxxxxxx";
var_dump(refreshToken($refreshToken, $clientId, $clientSecret));
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