Return List of Videos From Channel (Playlist)
What do I need to do to get the list of all videos from a specific channel (playlist)? I've got the `/channels/videos/list?channel_key=XXXXXXXX` endpoint. Then I found this page (https://developer.jwplayer.com/jw-platform/reference/v1/authentication.html) which talks about adding an api_key, api_timestamp, api_nonce, and api_signature to the request as well. I did that, but am now getting an invalid signature response.
Here's a sample of my code.
```
$api_key = 'XXXXXXXX';
$unix_timestamp = time();
$api_nonce = mt_rand(10000000, 99999999);
$api_signature = sha1($api_key . $unix_timestamp . $api_nonce);
$videos = $botr_api->call("/channels/videos/list?channel_key=XXXXXXXX&api_key=" . $api_key . "&api_timestamp=" . $unix_timestamp . "&api_nonce=" . $api_nonce . "&api_signature=" . $api_signature);
echo "<pre>";
print_r($videos);
echo "</pre>";
```
Can you point me in the right direction?