title: Adding products to a payment with PaymentIntents API
body: <p>I just finished setting up payments through stripe on PHP using their payment intents API and forgot about having to add the products/items the user has just purchased. </p>
  
  <p>Looking through the API Reference I didn't see anything where I could add items to the payment intent so I could retreive what was purchased later on in the webhook.</p>
  
  <p>Do I need to do my own magic and somehow add the items to the metadata array or is there something that i'm missing here?</p>