diff --git a/package.json b/package.json
index a1f0425..b9a0bfb 100644
--- a/package.json
+++ b/package.json
@@ -1,11 +1,15 @@
 {
   "name": "@apihub24/token-authentication",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "description": "",
   "main": "dist/index.js",
   "types": "./dist/index.d.ts",
   "scripts": {
-    "build": "tsc"
+    "build": "tsc",
+    "test": "jest",
+    "test:coverage": "jest --coverage",
+    "pub": "npm publish",
+    "rel": "npm i && npm run build && npm run test:coverage"
   },
   "dependencies": {
     "@nestjs/common": "^11.1.6",
@@ -15,7 +19,11 @@
     "class-validator": "^0.14.2"
   },
   "devDependencies": {
-    "typescript": "^5.9.2"
+    "@nestjs/testing": "^11.1.6",
+    "typescript": "^5.9.2",
+    "@types/jest": "^30.0.0",
+    "jest": "^30.0.0",
+    "ts-jest": "^29.4.1"
   },
   "keywords": [],
   "author": {
@@ -26,5 +34,26 @@
   "license": "MIT",
   "publishConfig": {
     "access": "public"
+  },
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "json",
+      "ts"
+    ],
+    "rootDir": ".",
+    "testRegex": ".*\\.spec\\.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "collectCoverageFrom": [
+      "**/*.(t|j)s"
+    ],
+    "coverageDirectory": "./coverage",
+    "testEnvironment": "node",
+    "roots": [
+      "<rootDir>/src/"
+    ],
+    "moduleNameMapper": {}
   }
 }
diff --git a/src/contracts/services/token.service.ts b/src/contracts/services/token.service.ts
index 64b9cb6..14636e3 100644
--- a/src/contracts/services/token.service.ts
+++ b/src/contracts/services/token.service.ts
@@ -1,8 +1,15 @@
 import { IAccount } from "../models/account";
 import { ISession } from "../models/session";
 
+export type Algorithm = "HS256" | "HS384" | "HS512";
+
 export interface ITokenService {
-  generate(session: ISession): Promise<string>;
+  generate(
+    session: ISession,
+    subject: string,
+    expires: string,
+    algorithm: Algorithm
+  ): Promise<string>;
   validate(token: string): Promise<boolean>;
   getAccount(token: string): Promise<IAccount | null>;
 }