feat(cashier): billing status type/enum

src/types/billing_status.ts

@@ -0,0 +1,11 @@
+/**
+ * Workflow status for cashier billing.
+ * Paid: billing has been fully paid
+ * Unpaid: billing has not been paid
+ * Partially paid: billing has been partially paid
+ */
+export enum BillingStatus {
+    PAID = "PAID",
+    UNPAID = "UNPAID",
+    PARTIALLY_PAID = "PARTIALLY_PAID",
+}