diff --git a/package.json b/package.json
index f169cad..8538d95 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@xsolla/pay-station-sdk",
-  "version": "0.0.22",
+  "version": "0.0.23",
   "description": "Pay Station SDK",
   "main": "dist/main.js",
   "types": "dist/index.d.ts",
diff --git a/src/features/headless-checkout/headless-checkout.ts b/src/features/headless-checkout/headless-checkout.ts
index 1d56eb2..d402f3e 100644
--- a/src/features/headless-checkout/headless-checkout.ts
+++ b/src/features/headless-checkout/headless-checkout.ts
@@ -34,11 +34,11 @@ import { FormFieldsStatus } from '../../core/form/form-fields-status.interface';
 import { getCombinedPaymentMethodsHandler } from './post-messages-handlers/get-combined-payment-methods.handler';
 import { CombinedPaymentMethods } from '../../core/combined-payment-methods.interface';
 import { ThemesLoader } from '../../core/customization/themes-loader';
-import { Themes } from '../../core/customization/themes.type';
 import { Lang } from '../../core/i18n/lang.enum';
 import { getCountryListHandler } from './post-messages-handlers/get-country-list.handler';
 import { CountryResponse } from '../../core/country-response.interface';
 import { FormLoader } from '../../core/form/form-loader';
+import { InitialOptions } from './initial-options.interface';
 
 @singleton()
 export class HeadlessCheckout {
@@ -165,12 +165,7 @@ export class HeadlessCheckout {
     private readonly formLoader: FormLoader,
   ) {}
 
-  public async init(environment: {
-    isWebview?: boolean;
-    sandbox?: boolean;
-    theme?: Themes;
-    language?: Lang;
-  }): Promise<void> {
+  public async init(environment: InitialOptions): Promise<void> {
     this.isWebView = environment.isWebview;
     this.isSandbox = environment.sandbox;
     this.theme = environment.theme;
@@ -249,6 +244,20 @@ export class HeadlessCheckout {
     ) as Promise<FinanceDetails | null>;
   }
 
+  public onUpdateFinanceDetails(
+    callbackFn: (financeDetails: FinanceDetails) => void,
+  ): void {
+    this.postMessagesClient.listen<FinanceDetails | null>(
+      EventName.financeDetails,
+      getFinanceDetailsHandler,
+      (financeDetails) => {
+        if (financeDetails) {
+          callbackFn(financeDetails);
+        }
+      },
+    );
+  }
+
   /**
    * Returns available payment methods except quick methods
    * @param country Country that quick methods should be loaded for.
diff --git a/src/features/headless-checkout/initial-options.interface.ts b/src/features/headless-checkout/initial-options.interface.ts
new file mode 100644
index 0000000..b5f7023
--- /dev/null
+++ b/src/features/headless-checkout/initial-options.interface.ts
@@ -0,0 +1,9 @@
+import { Themes } from '../../core/customization/themes.type';
+import { Lang } from '../../core/i18n/lang.enum';
+
+export interface InitialOptions {
+  isWebview?: boolean;
+  sandbox?: boolean;
+  theme?: Themes;
+  language?: Lang;
+}
diff --git a/src/index.ts b/src/index.ts
index 45a2f20..8428b2a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -6,3 +6,5 @@ export * from './web-components';
 export { Lang } from './core/i18n/lang.enum';
 export { EventName } from './core/event-name.enum';
 export { NextActionType } from './core/actions/next-action-type.enum';
+export { FinanceDetails } from './core/finance-details/finance-details.interface';
+export { InitialOptions } from './features/headless-checkout/initial-options.interface';