code has expired (within the last hour) dropbox - php

Question

Hi everyone i am new in dropbox api (php version).
i am getting authCode using authorizeUrl, its working good for only one time if i reload page error message shows on
'HTTP status 400 {"error_description": "code has expired (within the last hour)", "error": "invalid_grant"}
how to get permanent authCode from dropbox.
$appInfo = dbx\AppInfo::loadFromJsonFile("api-key.json");
$webAuth = new dbx\WebAuthNoRedirect($appInfo, "PHP-Example/1.0");
$authorizeUrl = $webAuth->start();
echo "1. Go to: " . $authorizeUrl . "\n";
echo "2. Click \"Allow\" (you might have to log in first).\n";
echo "3. Copy the authorization code.\n";
$authCode = "****************************************";
list($accessToken, $dropboxUserId) = $webAuth->finish($authCode);
print "Access Token: " . $accessToken . "\n";
$dbxClient = new dbx\Client($accessToken, "PHP-Example/1.0");
$accountInfo = $dbxClient->getAccountInfo();
print_r($accountInfo);

Answer 1

Found the solution in this error
some steps to solve this problem
go to Apps page Dropbox apps
add your site or localhost link to OAuth 2 Redirect URIs
next to generate access token, then copy the access token and use it .
finally remove this lines
list($accessToken, $dropboxUserId) = $webAuth->finish($authCode);
print "Access Token: " . $accessToken . "\n";
and paste directly in your access token into
$accessToken =
"VTEp2cvkQ8************************************";
it's working perfectly