diff --git a/packages/checkout/sdk/src/widgets/definitions/parameters/sale.ts b/packages/checkout/sdk/src/widgets/definitions/parameters/sale.ts
index 9a721ba740..c1463bcbe8 100644
--- a/packages/checkout/sdk/src/widgets/definitions/parameters/sale.ts
+++ b/packages/checkout/sdk/src/widgets/definitions/parameters/sale.ts
@@ -28,6 +28,8 @@ export type SaleWidgetParams = {
   excludeFiatCurrencies?: string[];
   /** Preferred currency, replacing the backend's base currency */
   preferredCurrency?: string;
+  /** Custom key-value pairs to be passed to the order */
+  customOrderData?: Record<string, unknown>;
 };
 
 /**
diff --git a/packages/checkout/widgets-lib/src/widgets/sale/SaleWidget.tsx b/packages/checkout/widgets-lib/src/widgets/sale/SaleWidget.tsx
index 6c939f4516..d65d34bcd4 100644
--- a/packages/checkout/widgets-lib/src/widgets/sale/SaleWidget.tsx
+++ b/packages/checkout/widgets-lib/src/widgets/sale/SaleWidget.tsx
@@ -39,7 +39,7 @@ import { EventTargetContext } from '../../context/event-target-context/EventTarg
 import { OrderSummary } from './views/OrderSummary';
 import { CreditCardWarningDrawer } from './components/CreditCardWarningDrawer';
 
-type OptionalWidgetParams = Pick<SaleWidgetParams, 'excludePaymentTypes' | 'excludeFiatCurrencies'>;
+type OptionalWidgetParams = Pick<SaleWidgetParams, 'excludePaymentTypes' | 'excludeFiatCurrencies' | 'customOrderData'>;
 type RequiredWidgetParams = Required<
 Omit<SaleWidgetParams, 'walletProviderName'>
 >;
@@ -63,6 +63,7 @@ export default function SaleWidget(props: SaleWidgetProps) {
     excludePaymentTypes,
     excludeFiatCurrencies,
     preferredCurrency,
+    customOrderData,
     hideExcludedPaymentTypes,
     waitFulfillmentSettlements = true,
   } = props;
@@ -131,6 +132,7 @@ export default function SaleWidget(props: SaleWidgetProps) {
           excludePaymentTypes,
           excludeFiatCurrencies,
           preferredCurrency,
+          customOrderData,
           waitFulfillmentSettlements,
           hideExcludedPaymentTypes,
         }}
diff --git a/packages/checkout/widgets-lib/src/widgets/sale/SaleWidgetRoot.tsx b/packages/checkout/widgets-lib/src/widgets/sale/SaleWidgetRoot.tsx
index 9a2100790f..cc9af8ff6f 100644
--- a/packages/checkout/widgets-lib/src/widgets/sale/SaleWidgetRoot.tsx
+++ b/packages/checkout/widgets-lib/src/widgets/sale/SaleWidgetRoot.tsx
@@ -156,6 +156,7 @@ export class Sale extends Base<WidgetType.SALE> {
                       this.parameters.excludeFiatCurrencies!
                     }
                     preferredCurrency={this.parameters.preferredCurrency!}
+                    customOrderData={this.parameters.customOrderData!}
                     hideExcludedPaymentTypes={
                       this.properties?.config?.hideExcludedPaymentTypes ?? false
                     }
diff --git a/packages/checkout/widgets-lib/src/widgets/sale/context/SaleContextProvider.tsx b/packages/checkout/widgets-lib/src/widgets/sale/context/SaleContextProvider.tsx
index 128126e864..a5db3713a1 100644
--- a/packages/checkout/widgets-lib/src/widgets/sale/context/SaleContextProvider.tsx
+++ b/packages/checkout/widgets-lib/src/widgets/sale/context/SaleContextProvider.tsx
@@ -48,6 +48,7 @@ type SaleContextProps = {
   excludePaymentTypes: SalePaymentTypes[];
   excludeFiatCurrencies?: string[];
   preferredCurrency?: string;
+  customOrderData?: Record<string, unknown>;
   waitFulfillmentSettlements: boolean;
   hideExcludedPaymentTypes: boolean;
 };
@@ -132,6 +133,7 @@ const SaleContext = createContext<SaleContextValues>({
   signTokenIds: [],
   excludePaymentTypes: [],
   preferredCurrency: undefined,
+  customOrderData: undefined,
   selectedCurrency: undefined,
   waitFulfillmentSettlements: true,
   hideExcludedPaymentTypes: false,
@@ -160,6 +162,7 @@ export function SaleContextProvider(props: {
       excludePaymentTypes,
       excludeFiatCurrencies,
       preferredCurrency,
+      customOrderData,
       waitFulfillmentSettlements,
       hideExcludedPaymentTypes,
     },
@@ -254,6 +257,7 @@ export function SaleContextProvider(props: {
     environmentId,
     environment,
     waitFulfillmentSettlements,
+    customOrderData,
   });
 
   const sign = useCallback(
diff --git a/packages/checkout/widgets-lib/src/widgets/sale/hooks/useSignOrder.ts b/packages/checkout/widgets-lib/src/widgets/sale/hooks/useSignOrder.ts
index 1b09dcf64c..834ea96b25 100644
--- a/packages/checkout/widgets-lib/src/widgets/sale/hooks/useSignOrder.ts
+++ b/packages/checkout/widgets-lib/src/widgets/sale/hooks/useSignOrder.ts
@@ -73,6 +73,7 @@ type SignApiRequest = {
     product_id: string;
     quantity: number;
   }[];
+  custom_data?: Record<string, unknown>;
 };
 
 type SignApiError = {
@@ -159,6 +160,7 @@ export const useSignOrder = (input: SignOrderInput) => {
     environment,
     environmentId,
     waitFulfillmentSettlements,
+    customOrderData,
   } = input;
   const [signError, setSignError] = useState<SignOrderError | undefined>(
     undefined,
@@ -274,6 +276,7 @@ export const useSignOrder = (input: SignOrderInput) => {
             product_id: item.productId,
             quantity: item.qty,
           })),
+          custom_data: customOrderData,
         };
 
         const baseUrl = `${PRIMARY_SALES_API_BASE_URL[environment]}/${environmentId}/order/sign`;
diff --git a/packages/checkout/widgets-lib/src/widgets/sale/types.ts b/packages/checkout/widgets-lib/src/widgets/sale/types.ts
index 26cb1f4529..e938074f06 100644
--- a/packages/checkout/widgets-lib/src/widgets/sale/types.ts
+++ b/packages/checkout/widgets-lib/src/widgets/sale/types.ts
@@ -54,6 +54,7 @@ export type SignOrderInput = {
   environment: string;
   environmentId: string;
   waitFulfillmentSettlements: boolean;
+  customOrderData?: Record<string, unknown>;
 };
 
 export type SignOrderError = {