One entry per child, newest first.
True while the child is switched on and not past its expiry.
When the child was made, as an ISO 8601 time.
What the child can still spend: the rest of its limit, never more than the parent holds. In USD.
What the child has spent, in USD.
When the child stops working, as an ISO 8601 time.
The first 12 characters of the child's hash. keyId gives the same id for a key you hold.
Most the child may spend, in USD. null means no limit beyond the parent's balance.
The child's per-minute cap, in USD. null means none.
Sums over every child.
How many children this key has made.
What they have spent together, in USD.
The answer from GET /key/children: the child keys this key made.