Added the Fetch Spend Exposure for a Balance endpoint (GET /v1/balances/{reference}/spend-exposure). Returns the aggregated spend-limit exposure across all eligible cards linked to a Balance for a given future period. The response includes totalEligibleCards, totalSpendLimitExposure, totalSpendLimitRemaining, and currency.
Added activeDuringStart and activeDuringEnd query parameters to Fetch Cards Associated to a Balance (GET /v1/balances/{reference}/cards). These ISO 8601 timestamps filter cards whose validity period overlaps the specified range; both must be provided together.
Added the following error codes to the Card and Balance Management conflict error schema: