feat: add payment module

modules/payment/schemas/currency.ts

@@ -0,0 +1,24 @@
+import z from "zod";
+
+/*
+ |--------------------------------------------------------------------------------
+ | Currency
+ |--------------------------------------------------------------------------------
+ |
+ | A union of currencies the system supports trade in.
+ |
+ */
+
+export const CurrencySchema = z.union([
+  z.literal("USD").describe("United States Dollar"),
+  z.literal("EUR").describe("Euro"),
+  z.literal("GBP").describe("British Pound Sterling"),
+  z.literal("CHF").describe("Swiss Franc"),
+  z.literal("JPY").describe("Japanese Yen"),
+  z.literal("CAD").describe("Canadian Dollar"),
+  z.literal("AUD").describe("Australian Dollar"),
+  z.literal("NOK").describe("Norwegian Krone"),
+  z.literal("SEK").describe("Swedish Krona"),
+]);
+
+export type Currency = z.output<typeof CurrencySchema>;