title: Stripe::Customer.create not attaching the payment method to customer
body: <p>I am creating a setup intent and receiving the payment method's id from it. Then I am creating a customer using the following code</p>
  <pre><code>customer = Stripe::Customer.create({
        email: current_user.email,
        description: &quot;Customer for subscription&quot;,
        payment_method: params[:payment_method]
      })
  </code></pre>
  <p>It is returning the following response</p>
  <pre><code>{
    &quot;id&quot;: &quot;cus_IZmhg4VhIwFUBI&quot;,
    &quot;object&quot;: &quot;customer&quot;,
    &quot;address&quot;: null,
    &quot;balance&quot;: 0,
    &quot;created&quot;: 1608037176,
    &quot;currency&quot;: null,
    &quot;default_source&quot;: null,
    &quot;delinquent&quot;: false,
    &quot;description&quot;: &quot;Customer for subscription&quot;,
    &quot;discount&quot;: null,
    &quot;email&quot;: &quot;customer@example.com&quot;,
    &quot;invoice_prefix&quot;: &quot;76BF0C5E&quot;,
    &quot;invoice_settings&quot;: {
      &quot;custom_fields&quot;: null,
      &quot;default_payment_method&quot;: null,
      &quot;footer&quot;: null
    },
    &quot;livemode&quot;: false,
    &quot;metadata&quot;: {
    },
    &quot;name&quot;: null,
    &quot;next_invoice_sequence&quot;: 1,
    &quot;phone&quot;: null,
    &quot;preferred_locales&quot;: [
  
    ],
    &quot;shipping&quot;: null,
    &quot;tax_exempt&quot;: &quot;none&quot;
  }
  </code></pre>
  <p>The problem is, it is not attaching the payment method to the customer, when I try to create a subscription using the customer object, it returns the following error:</p>
  <p><strong>Stripe::InvalidRequestError (This customer has no attached payment source or default payment method.):</strong></p>
  <p>But when I look in the dashboard, the payment method is already attached with the customer</p>