curl --request DELETE \
  --url https://api.natural.co/wallet/external-funding-sources/{externalFundingSourceId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{}'

{
  "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": {
    "deleted": true
  }
}