feat(payment): implement coffee tip plans and update payment flow

src/data/dto/payment/__tests__/payment_plan.test.ts

@@ -1,7 +1,11 @@
 import { describe, expect, it } from "vitest";
 import { z } from "zod";
 
-import { PaymentPlan, PaymentPlansResponse } from "@/data/dto/payment";
+import {
+  PaymentPlan,
+  PaymentPlansResponse,
+  TipPaymentPlansResponse,
+} from "@/data/dto/payment";
 
 describe("PaymentPlan", () => {
   it("parses the camelCase payment plan shape", () => {
@@ -133,3 +137,35 @@ describe("PaymentPlansResponse", () => {
     });
   });
 });
+
+describe("TipPaymentPlansResponse", () => {
+  it("keeps only fields used by the tip payment flow", () => {
+    const response = TipPaymentPlansResponse.fromJson({
+      plans: [
+        {
+          planId: "tip_coffee_usd_4_99",
+          planName: "Small Coffee",
+          orderType: "tip",
+          tipType: "coffee_small",
+          description: "Buy Elio a small coffee",
+          amountCents: 499,
+          currency: "USD",
+          autoRenew: false,
+          isFirstRechargeOffer: false,
+          firstRechargeDiscountPercent: 0,
+        },
+      ],
+    });
+
+    expect(response.toJson()).toEqual({
+      plans: [
+        {
+          planId: "tip_coffee_usd_4_99",
+          planName: "Small Coffee",
+          amountCents: 499,
+          currency: "USD",
+        },
+      ],
+    });
+  });
+});