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

{
  "data": [
    {
      "type": "externalFundingSource",
      "id": "efs_550e8400e29b41d4a716446655440000",
      "attributes": {
        "bankName": "Chase",
        "accountName": "Business Checking",
        "accountType": "checking",
        "lastFour": "6789",
        "verificationState": "verifiedInstantAuth",
        "status": "active",
        "createdAt": "2026-01-04T15:30:00Z"
      },
      "relationships": {
        "party": {
          "data": {
            "type": "party",
            "id": "pty_7c9e6679e29b41d4a716446655440001"
          }
        }
      }
    }
  ],
  "meta": {
    "pagination": {
      "hasMore": false,
      "nextCursor": null
    }
  }
}