dj-stripe: PaymentMethod event incorrect behavior

Describe the bug I encountered a new bug related to new models (#914 ) in current master. At least payment_method.*-events are not working correctly with the general crud-style handling.

The payload can contain ie. card id instead of real PaymentMethod IDs and that means you can’t currently retrieve them through stripe /v1/payment_methods/:id-api.

I also reported that to stripe (related IRC conversation: https://freenode.logbot.info/stripe/20190903#c2618918) because I think it’s bug in implementation of either the events or then the API

Anyway the current implementation indicates that we should check out all the events related to those new models if they really are doing what they supposed to. Preferably with real production environment, the data is not like in the documentation apparently.

Example event causing problems

{
  "id": "evt_1FEiXXXXXXXX",
  "object": "event",
  "api_version": "2018-11-08",
  "created": 1567541994,
  "data": {
    "object": {
      "id": "card_1DXXXXXXXXXXX",
      "object": "payment_method",
      "billing_details": {
        "address": {
          "city": null,
          "country": null,
          "line1": null,
          "line2": null,
          "postal_code": null,
          "state": null
        },
        "email": null,
        "name": "Charles Customer",
        "phone": null
      },
      "card": {
        "brand": "visa",
        "checks": {
          "address_line1_check": null,
          "address_postal_code_check": null,
          "cvc_check": null
        },
        "country": "FR",
        "exp_month": 8,
        "exp_year": 2022,
        "fingerprint": "xxxxx",
        "funding": "debit",
        "generated_from": null,
        "last4": "2222",
        "three_d_secure_usage": {
          "supported": true
        },
        "wallet": null
      },
      "created": 1545493504,
      "customer": "cus_ECbxxxxxxxxxx",
      "livemode": true,
      "metadata": {
      },
      "type": "card"
    }
  },
  "livemode": true,
  "pending_webhooks": 1,
  "request": {
    "id": "req_j9PAxxxxxxxxx",
    "idempotency_key": null
  },
  "type": "payment_method.detached"
}

Expected behavior Events should be handled with more specific handlers.

Environment

• dj-stripe version: [e.g. master at 0298f21e456b25232a6e47199db14cee18c9cfc1]

Can you reproduce the issue with the latest version of master?

Yes