fix: create product endpoint for old versions

shared/utils/cusEntUtils/convertCusEntUtils.ts

@@ -113,3 +113,37 @@ export const cusEntToMaxPurchase = ({
 
 	return 0;
 };
+
+// NEW CUS ENT UTILS
+export const cusEntToGrantedBalance = ({
+	cusEnt,
+	entityId,
+	withRollovers = false,
+}: {
+	cusEnt: FullCusEntWithFullCusProduct;
+	entityId?: string;
+	withRollovers?: boolean;
+}) => {
+	const rollover = getRolloverFields({
+		cusEnt,
+		entityId,
+	});
+
+	const { count: entityCount } = getCusEntBalance({
+		cusEnt,
+		entityId,
+	});
+
+	const grantedBalance = cusEnt.entitlement.allowance || 0;
+
+	const total = new Decimal(grantedBalance).mul(entityCount).toNumber();
+
+	if (withRollovers && rollover) {
+		return new Decimal(total)
+			.add(rollover.balance)
+			.add(rollover.usage)
+			.toNumber();
+	}
+
+	return total;
+};