BillingTopupCreditBalance

Lifetime spendable credits granted on the top-up product, excluding expired credits. Unlike the monthly allowance, this never resets. Null when the credit ledger is unavailable or does not reconcile against remaining.

Lifetime credits consumed from the top-up product. Null when lifetimeGranted is unavailable.

Credits remaining from purchased top-up bundles. Top-up credits do not expire and are used after the monthly allowance is exhausted.