fix(payment): default nullable first recharge offer

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

@@ -114,4 +114,22 @@ describe("PaymentPlansResponse", () => {
       promotionType: "first_recharge_half_price",
     });
   });
+
+  it("defaults nullable first recharge offer metadata", () => {
+    const response = PaymentPlansResponse.from({
+      isFirstRecharge: true,
+      firstRechargeOffer: {
+        enabled: null,
+        type: null,
+        discountPercent: null,
+      },
+      plans: [],
+    });
+
+    expect(response.firstRechargeOffer).toEqual({
+      enabled: false,
+      type: "",
+      discountPercent: 0,
+    });
+  });
 });