diff --git a/package-lock.json b/package-lock.json
index 3ae43ea..eaf8223 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "bs58": "6.0.0",
         "elliptic": "6.6.1",
         "lodash": "4.17.21",
-        "zod": "3.25.76"
+        "zod": "4.1.8"
       },
       "bin": {
         "bitpay-sdk": "bin/index.js"
@@ -9400,9 +9400,9 @@
       }
     },
     "node_modules/zod": {
-      "version": "3.25.76",
-      "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
-      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+      "version": "4.1.8",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.1.8.tgz",
+      "integrity": "sha512-5R1P+WwQqmmMIEACyzSvo4JXHY5WiAFHRMg+zBZKgKS+Q1viRa0C1hmUKtHltoIFKtIdki3pRxkmpP74jnNYHQ==",
       "license": "MIT",
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
diff --git a/package.json b/package.json
index 97ac586..afad0dd 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "bs58": "6.0.0",
     "elliptic": "6.6.1",
     "lodash": "4.17.21",
-    "zod": "3.25.76"
+    "zod": "4.1.8"
   },
   "devDependencies": {
     "@types/bs58": "4.0.4",
diff --git a/src/Model/Invoice/Invoice.zod.ts b/src/Model/Invoice/Invoice.zod.ts
index 9584caf..5a1c216 100644
--- a/src/Model/Invoice/Invoice.zod.ts
+++ b/src/Model/Invoice/Invoice.zod.ts
@@ -1,13 +1,13 @@
 import { z } from 'zod';
 import { buyerInterfaceSchema } from './Buyer.zod';
-import { invoiceTransactionSchema } from './InvoiceTransaction.zod';
 import { invoiceBuyerProvidedInfoSchema } from './InvoiceBuyerProvidedInfo.zod';
+import { invoiceRefundAddressesSchema } from './InvoiceRefundAddresses.zod';
+import { invoiceTransactionSchema } from './InvoiceTransaction.zod';
 import { invoiceUniversalCodesSchema } from './InvoiceUniversalCodes.zod';
+import { minerFeesItemSchema } from './MinerFeesItem.zod';
 import { refundInfoSchema } from './RefundInfo.zod';
 import { shopperSchema } from './Shopper.zod';
-import { minerFeesItemSchema } from './MinerFeesItem.zod';
 import { supportedTransactionCurrencySchema } from './SupportedTransactionCurrency.zod';
-import { invoiceRefundAddressesSchema } from './InvoiceRefundAddresses.zod';
 
 export const invoiceSchema = z.object({
   buyer: buyerInterfaceSchema.optional(),
@@ -18,7 +18,6 @@ export const invoiceSchema = z.object({
   shopper: shopperSchema.optional(),
   refundInfo: refundInfoSchema.optional(),
   universalCodes: invoiceUniversalCodesSchema.optional(),
-
   currency: z.string().optional(),
   guid: z.string().optional(),
   token: z.string().optional(),
@@ -56,17 +55,17 @@ export const invoiceSchema = z.object({
   transactionCurrency: z.string().optional(),
   amountPaid: z.number().optional(),
   displayAmountPaid: z.string().optional(),
-  exchangeRates: z.record(z.record(z.number())).nullable(),
-  paymentSubtotals: z.record(z.number()).nullable(),
-  paymentTotals: z.record(z.number()).nullable(),
-  paymentDisplayTotals: z.record(z.string()).nullable(),
-  paymentDisplaySubTotals: z.record(z.string()).nullable(),
+  exchangeRates: z.record(z.string(), z.record(z.string(), z.number())).nullable(),
+  paymentSubtotals: z.record(z.string(), z.number()).nullable(),
+  paymentTotals: z.record(z.string(), z.number()).nullable(),
+  paymentDisplayTotals: z.record(z.string(), z.string()).nullable(),
+  paymentDisplaySubTotals: z.record(z.string(), z.string()).nullable(),
   nonPayProPaymentReceived: z.boolean().optional(),
   jsonPayProRequired: z.boolean().optional(),
   merchantName: z.string().optional(),
   bitpayIdRequired: z.boolean().optional(),
   underpaidAmount: z.number().optional(),
   overpaidAmount: z.number().optional(),
-  paymentCodes: z.record(z.record(z.string())).nullable(),
+  paymentCodes: z.record(z.string(), z.record(z.string(), z.string())).nullable(),
   isCancelled: z.boolean().optional()
 });
diff --git a/src/Model/Invoice/RefundInfo.zod.ts b/src/Model/Invoice/RefundInfo.zod.ts
index a68f7f1..d5dd538 100644
--- a/src/Model/Invoice/RefundInfo.zod.ts
+++ b/src/Model/Invoice/RefundInfo.zod.ts
@@ -3,5 +3,5 @@ import { z } from 'zod';
 export const refundInfoSchema = z.object({
   supportRequest: z.string(),
   currency: z.string(),
-  amounts: z.record(z.number()).optional()
+  amounts: z.record(z.string(), z.number()).optional()
 });
diff --git a/src/Model/Payout/Payout.zod.ts b/src/Model/Payout/Payout.zod.ts
index 66bec12..3f88981 100644
--- a/src/Model/Payout/Payout.zod.ts
+++ b/src/Model/Payout/Payout.zod.ts
@@ -23,7 +23,7 @@ export const payoutInterfaceSchema = z.object({
   status: z.string().optional(),
   groupId: z.string().optional(),
   requestDate: z.string().optional(),
-  exchangeRates: z.record(z.record(z.number())).optional(),
+  exchangeRates: z.record(z.string(), z.record(z.string(), z.number())).optional(),
   code: z.number().optional(),
   ignoreEmails: z.boolean().optional()
 });
diff --git a/src/Model/Settlement/InvoiceData.zod.ts b/src/Model/Settlement/InvoiceData.zod.ts
index 3e77a33..3b50fe4 100644
--- a/src/Model/Settlement/InvoiceData.zod.ts
+++ b/src/Model/Settlement/InvoiceData.zod.ts
@@ -9,5 +9,5 @@ export const invoiceDataInterfaceSchema = z.object({
   date: z.string().optional(),
   currency: z.string().optional(),
   transactionCurrency: z.string().optional(),
-  payoutPercentage: z.record(z.number()).optional()
+  payoutPercentage: z.record(z.string(), z.number()).optional()
 });
diff --git a/src/Model/Settlement/RefundInfo.zod.ts b/src/Model/Settlement/RefundInfo.zod.ts
index cbabd55..981c9e5 100644
--- a/src/Model/Settlement/RefundInfo.zod.ts
+++ b/src/Model/Settlement/RefundInfo.zod.ts
@@ -4,5 +4,5 @@ export const refundInfoInterfaceSchema = z.object({
   supportRequest: z.string().optional(),
   currency: z.string(),
   refundRequestEid: z.string().optional(),
-  amounts: z.record(z.number()).optional()
+  amounts: z.record(z.string(), z.number()).optional()
 });
diff --git a/src/Model/Webhook/InvoiceWebhook.zod.ts b/src/Model/Webhook/InvoiceWebhook.zod.ts
index 7e90e75..4ece486 100644
--- a/src/Model/Webhook/InvoiceWebhook.zod.ts
+++ b/src/Model/Webhook/InvoiceWebhook.zod.ts
@@ -12,9 +12,9 @@ export const invoiceWebhookSchema = z.object({
   currencyTime: z.string().optional(),
   exceptionStatus: z.string().optional(),
   buyerFields: invoiceWebhookBuyerFieldsInterfaceSchema.optional(),
-  paymentSubtotals: z.record(z.number()).nullable(),
-  paymentTotals: z.record(z.number()).nullable(),
-  exchangeRates: z.record(z.record(z.number())).nullable(),
+  paymentSubtotals: z.record(z.string(), z.number()).nullable(),
+  paymentTotals: z.record(z.string(), z.number()).nullable(),
+  exchangeRates: z.record(z.string(), z.record(z.string(), z.number())).nullable(),
   amountPaid: z.number().optional(),
   orderId: z.string().optional(),
   transactionCurrency: z.string().optional(),
diff --git a/src/Model/Webhook/PayoutWebhook.zod.ts b/src/Model/Webhook/PayoutWebhook.zod.ts
index d95c37a..88875d7 100644
--- a/src/Model/Webhook/PayoutWebhook.zod.ts
+++ b/src/Model/Webhook/PayoutWebhook.zod.ts
@@ -8,7 +8,7 @@ export const payoutWebhookSchema = z.object({
   price: z.number().optional(),
   currency: z.string().optional(),
   ledgerCurrency: z.string().optional(),
-  exchangeRates: z.record(z.record(z.number())).optional(),
+  exchangeRates: z.record(z.string(), z.record(z.string(), z.number())).optional(),
   email: z.string().optional(),
   reference: z.string().optional(),
   label: z.string().optional(),