refactor(dto): centralize backend schema defaults

src/data/schemas/payment/create_payment_order_response.ts

@@ -3,6 +3,8 @@
  */
 import { z } from "zod";
 
+import { stringOrNull } from "../nullable-defaults";
+
 const paymentUrlKeys = [
   "cashierUrl",
   "cashier_url",
@@ -20,17 +22,17 @@ const paymentUrlKeys = [
 export const CreatePaymentOrderResponseSchema = z.object({
   orderId: z.string(),
   payParams: z.record(z.string(), z.unknown()),
-  cashierUrl: z.string().optional(),
-  cashier_url: z.string().optional(),
-  checkoutUrl: z.string().optional(),
-  checkout_url: z.string().optional(),
-  paymentUrl: z.string().optional(),
-  payment_url: z.string().optional(),
-  approvalUrl: z.string().optional(),
-  approval_url: z.string().optional(),
-  redirectUrl: z.string().optional(),
-  redirect_url: z.string().optional(),
-  url: z.string().optional(),
+  cashierUrl: stringOrNull,
+  cashier_url: stringOrNull,
+  checkoutUrl: stringOrNull,
+  checkout_url: stringOrNull,
+  paymentUrl: stringOrNull,
+  payment_url: stringOrNull,
+  approvalUrl: stringOrNull,
+  approval_url: stringOrNull,
+  redirectUrl: stringOrNull,
+  redirect_url: stringOrNull,
+  url: stringOrNull,
 }).transform((data) => {
   const payParams = { ...data.payParams };
 

src/data/schemas/payment/payment_plan.ts

@@ -3,20 +3,26 @@
  */
 import { z } from "zod";
 
+import {
+  booleanOrFalse,
+  numberOrNull,
+  stringOrNull,
+} from "../nullable-defaults";
+
 export const PaymentPlanSchema = z.object({
   planId: z.string(),
   planName: z.string(),
   orderType: z.string(),
-  vipDays: z.number().nullable(),
-  dolAmount: z.number().nullable(),
+  vipDays: numberOrNull,
+  dolAmount: numberOrNull,
   creditBalance: z.number(),
   amountCents: z.number(),
-  originalAmountCents: z.number().nullable().default(null),
-  dailyPriceCents: z.number().nullable().default(null),
+  originalAmountCents: numberOrNull,
+  dailyPriceCents: numberOrNull,
   currency: z.string(),
-  isFirstRechargeOffer: z.boolean().default(false),
-  firstRechargeDiscountPercent: z.number().nullable().default(null),
-  promotionType: z.string().nullable().default(null),
+  isFirstRechargeOffer: booleanOrFalse,
+  firstRechargeDiscountPercent: numberOrNull,
+  promotionType: stringOrNull,
 });
 
 export type PaymentPlanInput = z.input<typeof PaymentPlanSchema>;

src/data/schemas/payment/payment_plans_response.ts

@@ -3,7 +3,13 @@
  */
 import { z } from "zod";
 
-import { booleanOrFalse, numberOrZero, stringOrEmpty } from "../nullable-defaults";
+import {
+  arrayOrEmpty,
+  booleanOrFalse,
+  numberOrZero,
+  schemaOrNull,
+  stringOrEmpty,
+} from "../nullable-defaults";
 import { PaymentPlanSchema } from "./payment_plan";
 
 export const FirstRechargeOfferSchema = z.object({
@@ -13,9 +19,9 @@ export const FirstRechargeOfferSchema = z.object({
 });
 
 export const PaymentPlansResponseSchema = z.object({
-  isFirstRecharge: z.boolean().default(false),
-  firstRechargeOffer: FirstRechargeOfferSchema.nullable().default(null),
-  plans: z.array(PaymentPlanSchema),
+  isFirstRecharge: booleanOrFalse,
+  firstRechargeOffer: schemaOrNull(FirstRechargeOfferSchema),
+  plans: arrayOrEmpty(PaymentPlanSchema),
 });
 
 export type PaymentPlansResponseInput = z.input<

src/data/schemas/payment/payment_vip_status_response.ts

@@ -3,9 +3,11 @@
  */
 import { z } from "zod";
 
+import { booleanOrFalse, stringOrNull } from "../nullable-defaults";
+
 export const PaymentVipStatusResponseSchema = z.object({
-  isVip: z.boolean(),
-  vipExpiresAt: z.string().nullable(),
+  isVip: booleanOrFalse,
+  vipExpiresAt: stringOrNull,
 });
 
 export type PaymentVipStatusResponseInput = z.input<