curl --request POST \
  --url https://api.enterprise.sandbox.uphold.com/core/external-accounts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "type": "bank",
  "asset": "USD",
  "network": "ach",
  "label": "My ACH Bank Account",
  "address": {
    "country": "US",
    "subdivision": "US-CA",
    "city": "San Francisco",
    "line1": "123 Main Street",
    "line2": "Apt 4B",
    "postalCode": "94102"
  },
  "routingNumber": "121000248",
  "accountNumber": "9876543210",
  "accountType": "checking"
}
'

{
  "externalAccount": {
    "id": "550e8400-e29b-41d4-a716-446655440000",
    "ownerId": "1e32fca3-23f7-40ed-bc1b-de10c790182d",
    "type": "bank",
    "status": "ok",
    "label": "My ACH Bank Account",
    "asset": "USD",
    "network": "ach",
    "features": [
      "withdraw"
    ],
    "details": {
      "address": {
        "country": "US",
        "subdivision": "US-CA",
        "city": "San Francisco",
        "line1": "123 Main Street",
        "line2": "Apt 4B",
        "postalCode": "94102"
      },
      "routingNumber": "121000248",
      "accountNumber": "9876543210",
      "accountType": "checking",
      "secondaryNetworks": {
        "withdraw": [
          "fednow"
        ]
      }
    },
    "createdAt": "2024-06-01T00:00:00.000Z",
    "updatedAt": "2024-07-15T00:00:00.000Z"
  }
}