No setters for protected arguments

[danmichaelo]

Seems to be no way to set lease_seconds, verify etc.??

[danmichaelo]

Suggestion: Add an $options array to the constructor and extract the optional values from there:

public function __construct($hub_url, $callback_url, $credentials = false, $options = [])
    $this->lease_seconds = isset($options['lease_seconds']) ? $options['lease_seconds'] : null;
    ...