private static function getBaseUrl($config)
{
if (array_key_exists('openid.RedirectUri', $config)) {
return $config['openid.RedirectUri'];
} else {
if (array_key_exists('mode', $config)) {
switch (strtoupper($config['mode'])) {
case 'SANDBOX':
return PayPalConstants::OPENID_REDIRECT_SANDBOX_URL;
case 'LIVE':
return PayPalConstants::OPENID_REDIRECT_LIVE_URL;
}
}
}
return null;
}