title: Calling two async functions
body: <p>I'm new to async and await and I'm thinking about calling two Stripe APIs in an express api endpoint. Is that possible?</p>
  <pre class="lang-js prettyprint-override"><code>server.post('/ephemeral_keys', async (req, res) =&gt; {
      let customerId = req.body[&quot;customerId&quot;];
  
      //TODO IF customerId is null create new one 
      //It got stuck here.
      customerId = await stripe.customers.create({
          description: 'My First Test Customer (created for API docs)',
      });
  
      let key = await stripe.ephemeralKeys.create({
          customer: customerId
      }, {
          apiVersion: api_version
      }, );
      res.json(key);
  });
  </code></pre>
  <p>error :DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.</p>