title: Laravel stripe preview Invoice if the subscription has a scheduled transition
body: <p>Logic of my subscriptions.
  If the transition from smaller to larger is smooth, I calculate proportionally.
  If there was a transition from a higher to a lower tariff, I set the scheduler, until the end of the subscription time I use the current one and only the subscription below applies to this field.</p>
  <p>But the problem is when I have a subscription with a planned transition and want to see a proportional deduction from tariff 2 to tariff 3</p>
  <pre><code> $this-&gt;user-&gt;subscription()-&gt;previewInvoice($request-&gt;plan)
  enter code here
  </code></pre>
  <p>Returns null.
  Only after I have reset the planner from the subscription can I continue to display</p>
  <pre><code>$this-&gt;user-&gt;subscription()-&gt;previewInvoice($request-&gt;plan).
  </code></pre>
  <p>error
  The subscription is managed by the subscription schedule sub_sched_1KzOn1LueT3PfXuFbTGP5RxT, and updating any cancelation behavior is not allowed.</p>
  <p>can I virtually calculate so as not to affect the scheduler?</p>
  <p>Can you tell me how to get it, it causes a problem.</p>