diff --git a/package.json b/package.json
index 4b78812..e6c04e0 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "simpay-typescript-api",
   "author": "Rafał Więcek",
-  "version": "3.0.1",
+  "version": "3.0.2",
   "description": "SimPay.pl API wrapper",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/src/payments/directbilling.ts b/src/payments/directbilling.ts
index 67ab461..ca7921a 100644
--- a/src/payments/directbilling.ts
+++ b/src/payments/directbilling.ts
@@ -11,11 +11,12 @@ import type { PartialDbTransaction } from '../models/directbilling/transaction/p
 import type { PaginatedResponse } from '../models/response/paginated.response.js';
 
 export class DirectBilling {
-    private readonly key: string;
-    private readonly password: string;
     private readonly client: AxiosInstance;
 
-    constructor(key: string, password: string) {
+    constructor(
+        private readonly key: string,
+        private readonly password: string,
+    ) {
         this.key = key;
         this.password = password;
 
@@ -24,7 +25,7 @@ export class DirectBilling {
             headers: {
                 'X-SIM-KEY': this.key,
                 'X-SIM-PASSWORD': this.password,
-                'X-SIM-VERSION': '2.2.2',
+                'X-SIM-VERSION': '3.0.2',
                 'X-SIM-PLATFORM': 'TYPESCRIPT',
             },
         });
diff --git a/src/payments/sms.ts b/src/payments/sms.ts
index df0ace0..cbb2e2a 100644
--- a/src/payments/sms.ts
+++ b/src/payments/sms.ts
@@ -6,20 +6,18 @@ import type { SmsTransaction } from '../models/sms/transaction/sms.transaction.j
 import type { VerificationResponse } from '../models/sms/verification.response.js';
 
 export class Sms {
-    private readonly key: string;
-    private readonly password: string;
     private readonly client: AxiosInstance;
 
-    constructor(key: string, password: string) {
-        this.key = key;
-        this.password = password;
-
+    constructor(
+        private readonly key: string,
+        private readonly password: string,
+    ) {
         this.client = axios.create({
             baseURL: 'https://api.simpay.pl/sms',
             headers: {
                 'X-SIM-KEY': this.key,
                 'X-SIM-PASSWORD': this.password,
-                'X-SIM-VERSION': '2.2.2',
+                'X-SIM-VERSION': '3.0.2',
                 'X-SIM-PLATFORM': 'TYPESCRIPT',
             },
         });