curl --request GET \
  --url https://api.covenance.com/sub-account/{subAccountId} \
  --header 'x-api-key: <api-key>'

{
  "id": "<string>",
  "name": "<string>",
  "balance": {
    "amountCents": 123
  },
  "spend": {
    "amountCents": 123
  }
}