One line of a posting: an account and the amount applied, debit-positive — a credit is stored
negated whatever the account's normal side, so the sign is the ledger's, not the account
holder's (a top-up's wallet leg is negative). balanceDelta (from /store-kit) converts a
leg to the signed change in that account's balance.
One line of a posting: an account and the amount applied, debit-positive — a credit is stored negated whatever the account's normal side, so the sign is the ledger's, not the account holder's (a top-up's wallet leg is negative).
balanceDelta(from/store-kit) converts a leg to the signed change in that account's balance.