curl --request GET \
  --url https://api.natural.co/wallet/external-funding-sources \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "type": "external_funding_source",
      "id": "efs_019cd3444a77776dadda2c30ff23706d",
      "attributes": {
        "bank_name": "Chase",
        "account_type": "checking",
        "last_four": "6789",
        "verification_state": "VERIFIED",
        "status": "VERIFIED",
        "created_at": "2026-01-01T00:00:00"
      },
      "relationships": {
        "party": {
          "data": {
            "type": "party",
            "id": "pty_019cd3444a77776dadda2c30ff23706d"
          }
        }
      }
    }
  ],
  "meta": {
    "pagination": {
      "has_more": false,
      "next_cursor": null
    }
  }
}