How to create a subscription based off a payment intent?

So after an evening of swearing in front of my computer I managed to get the creation of payment intents going including 3D Secure. The EU certainly makes it difficult now with SCA and VAT MOSS.

Anyway:

The intent is shown as a verified and uncaptured payment. How the heck do I use this to create a subscription and capture the payment?

What I now do:

Use Elements to get card data, send to PHP, blablaba and end up with a payment intent for €20.
If that succeeds I create a customer and attach the intent to this customer.
After that I tried to Subscribe the user to a plan but I get this error:

{
  "error": {
    "code": "resource_missing",
    "doc_url": "https://stripe.com/docs/error-codes/resource-missing",
    "message": "This customer has no attached payment source",
    "type": "invalid_request_error"
  }
}

The plan comes with VAT attached so the €20 becomes €23,80. In payments I can see a completely new payment for €23,80 but marked as failed.

I am using this to create a Subscription:

  {
      $subscription = \Stripe\Subscription::create([
      "customer" => $customer['id'],
      "items" => [
        [
          "plan" => "plan_F91vJfk2jxYbCf",
          "tax_rates" => ["txr_1EehRsHf224l2JTULVwmg0vF"]
        ],
      ],

      "metadata" => ['user_id' => "123456", "taxamo_key" => "blablablabla--pMYc"]
    ]);
  }

stripe / stripe-php

How to create a subscription based off a payment intent? #664