diff --git a/.gitignore b/.gitignore
index 0edf183..c5642df 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,5 @@ node_modules/
 .idea/
 .env
 package-lock.json
+dist/
+types/
\ No newline at end of file
diff --git a/.mocharc.json b/.mocharc.json
new file mode 100644
index 0000000..d81a4e0
--- /dev/null
+++ b/.mocharc.json
@@ -0,0 +1,5 @@
+{
+  "extensions": ["ts"],
+  "spec": "test/**/*.ts",
+  "require": "ts-node/register"
+}
\ No newline at end of file
diff --git a/index.js b/index.js
deleted file mode 100644
index f9017ec..0000000
--- a/index.js
+++ /dev/null
@@ -1,119 +0,0 @@
-require('dotenv').config();
-const axios = require('axios').default;
-const crypto = require('crypto');
-const constants = require('constants');
-
-let mpesaConfig;
-
-function _getBearerToken(mpesa_public_key, mpesa_api_key) {
-    const publicKey = "-----BEGIN PUBLIC KEY-----\n"+mpesa_public_key+"\n"+"-----END PUBLIC KEY-----";
-    const buffer = Buffer.from(mpesa_api_key);
-    const encrypted = crypto.publicEncrypt({
-        'key': publicKey,
-        'padding': constants.RSA_PKCS1_PADDING,
-    }, buffer);
-    return encrypted.toString("base64");
-}
-
-function initialize_api_from_dotenv() {
-    if (!mpesaConfig) {
-        mpesaConfig = {
-            baseUrl: process.env.MPESA_API_HOST,
-            apiKey: process.env.MPESA_API_KEY,
-            publicKey: process.env.MPESA_PUBLIC_KEY,
-            origin: process.env.MPESA_ORIGIN,
-            serviceProviderCode: process.env.MPESA_SERVICE_PROVIDER_CODE
-        };
-        validateConfig(mpesaConfig);
-        console.log("Using M-Pesa environment configuration");
-    } else {
-        console.log("Using custom M-Pesa configuration");
-    }
-}
-
-function required_config_arg(argName) {
-    return "Please provide a valid " + argName + " in the configuration when calling initializeApi()";
-}
-
-function validateConfig(configParams) {
-    if (!configParams.baseUrl) {
-        throw required_config_arg("baseUrl")
-    }
-    if (!configParams.apiKey) {
-        throw required_config_arg("apiKey")
-    }
-    if (!configParams.publicKey) {
-        throw required_config_arg("publicKey")
-    }
-    if (!configParams.origin) {
-        throw required_config_arg("origin")
-    }
-    if (!configParams.serviceProviderCode) {
-        throw required_config_arg("serviceProviderCode")
-    }
-}
-
-module.exports.initializeApi = function (configParams) {
-    validateConfig(configParams);
-    mpesaConfig = configParams;
-};
-
-module.exports.initiate_c2b = async function (amount, msisdn, transaction_ref, thirdparty_ref) {
-    initialize_api_from_dotenv();
-    try {
-        let response;
-        response = await axios({
-            method: 'post',
-            url: 'https://' + mpesaConfig.baseUrl + ':18352/ipg/v1x/c2bPayment/singleStage/',
-            headers: {
-                'Content-Type': 'application/json',
-                'Authorization': 'Bearer ' + _getBearerToken(mpesaConfig.publicKey, mpesaConfig.apiKey),
-                'Origin': mpesaConfig.origin
-            },
-            data: {
-                "input_TransactionReference": transaction_ref,
-                "input_CustomerMSISDN": msisdn + "",
-                "input_Amount": amount + "",
-                "input_ThirdPartyReference": thirdparty_ref,
-                "input_ServiceProviderCode": mpesaConfig.serviceProviderCode + ""
-            }
-        });
-        return response.data;
-    } catch (e) {
-        if (e.response.data) {
-            throw e.response.data;
-        } else {
-            throw e;
-        }
-    }
-};
-
-module.exports.initiate_b2c = async function (amount, msisdn, transaction_ref, thirdparty_ref) {
-    initialize_api_from_dotenv();
-    try {
-        let response;
-        response = await axios({
-            method: 'post',
-            url: 'https://' + mpesaConfig.baseUrl + ':18345/ipg/v1x/b2cPayment/',
-            headers: {
-                'Content-Type': 'application/json',
-                'Authorization': 'Bearer ' + _getBearerToken(mpesaConfig.publicKey, mpesaConfig.apiKey),
-                'Origin': mpesaConfig.origin
-            },
-            data: {
-                "input_TransactionReference": transaction_ref,
-                "input_CustomerMSISDN": msisdn + "",
-                "input_Amount": amount + "",
-                "input_ThirdPartyReference": thirdparty_ref,
-                "input_ServiceProviderCode": mpesaConfig.serviceProviderCode + ""
-            }
-        });
-        return response.data;
-    } catch (e) {
-        if (e.response.data) {
-            throw e.response.data;
-        } else {
-            throw e;
-        }
-    }
-};
diff --git a/index.ts b/index.ts
new file mode 100644
index 0000000..f6cef2f
--- /dev/null
+++ b/index.ts
@@ -0,0 +1,127 @@
+import dotenv from 'dotenv';
+import axios, { AxiosResponse } from 'axios';
+import crypto from 'crypto';
+import constants from 'constants';
+
+dotenv.config();
+
+interface MpesaConfig {
+    baseUrl: string;
+    apiKey: string;
+    publicKey: string;
+    origin: string;
+    serviceProviderCode: string;
+}
+
+let mpesaConfig: MpesaConfig | undefined;
+
+function _getBearerToken(mpesa_public_key: string, mpesa_api_key: string): string {
+    const publicKey = `-----BEGIN PUBLIC KEY-----\n${mpesa_public_key}\n-----END PUBLIC KEY-----`;
+    const buffer = Buffer.from(mpesa_api_key);
+    const encrypted = crypto.publicEncrypt({
+        key: publicKey,
+        padding: constants.RSA_PKCS1_PADDING,
+    }, buffer);
+    return encrypted.toString("base64");
+}
+
+function initialize_api_from_dotenv(): void {
+    if (!mpesaConfig) {
+        mpesaConfig = {
+            baseUrl: process.env.MPESA_API_HOST || '',
+            apiKey: process.env.MPESA_API_KEY || '',
+            publicKey: process.env.MPESA_PUBLIC_KEY || '',
+            origin: process.env.MPESA_ORIGIN || '',
+            serviceProviderCode: process.env.MPESA_SERVICE_PROVIDER_CODE || ''
+        };
+        validateConfig(mpesaConfig);
+        console.log("Using M-Pesa environment configuration");
+    } else {
+        console.log("Using custom M-Pesa configuration");
+    }
+}
+
+function required_config_arg(argName: string): string {
+    return `Please provide a valid ${argName} in the configuration when calling initializeApi()`;
+}
+
+function validateConfig(configParams: MpesaConfig): void {
+    if (!configParams.baseUrl) {
+        throw required_config_arg("baseUrl");
+    }
+    if (!configParams.apiKey) {
+        throw required_config_arg("apiKey");
+    }
+    if (!configParams.publicKey) {
+        throw required_config_arg("publicKey");
+    }
+    if (!configParams.origin) {
+        throw required_config_arg("origin");
+    }
+    if (!configParams.serviceProviderCode) {
+        throw required_config_arg("serviceProviderCode");
+    }
+}
+
+export const initializeApi = (configParams: MpesaConfig): void => {
+    validateConfig(configParams);
+    mpesaConfig = configParams;
+};
+
+export const initiate_c2b = async (amount: number, msisdn: string, transaction_ref: string, thirdparty_ref: string): Promise<any> => {
+    initialize_api_from_dotenv();
+    try {
+        const response: AxiosResponse = await axios({
+            method: 'post',
+            url: `https://${mpesaConfig?.baseUrl}:18352/ipg/v1x/c2bPayment/singleStage/`,
+            headers: {
+                'Content-Type': 'application/json',
+                'Authorization': `Bearer ${_getBearerToken(mpesaConfig?.publicKey || '', mpesaConfig?.apiKey || '')}`,
+                'Origin': mpesaConfig?.origin || ''
+            },
+            data: {
+                "input_TransactionReference": transaction_ref,
+                "input_CustomerMSISDN": msisdn,
+                "input_Amount": amount.toString(),
+                "input_ThirdPartyReference": thirdparty_ref,
+                "input_ServiceProviderCode": mpesaConfig?.serviceProviderCode || ''
+            }
+        });
+        return response.data;
+    } catch (e: any) {
+        if (e.response?.data) {
+            throw e.response.data;
+        } else {
+            throw e;
+        }
+    }
+};
+
+export const initiate_b2c = async (amount: number, msisdn: string, transaction_ref: string, thirdparty_ref: string): Promise<any> => {
+    initialize_api_from_dotenv();
+    try {
+        const response: AxiosResponse = await axios({
+            method: 'post',
+            url: `https://${mpesaConfig?.baseUrl}:18345/ipg/v1x/b2cPayment/`,
+            headers: {
+                'Content-Type': 'application/json',
+                'Authorization': `Bearer ${_getBearerToken(mpesaConfig?.publicKey || '', mpesaConfig?.apiKey || '')}`,
+                'Origin': mpesaConfig?.origin || ''
+            },
+            data: {
+                "input_TransactionReference": transaction_ref,
+                "input_CustomerMSISDN": msisdn,
+                "input_Amount": amount.toString(),
+                "input_ThirdPartyReference": thirdparty_ref,
+                "input_ServiceProviderCode": mpesaConfig?.serviceProviderCode || ''
+            }
+        });
+        return response.data;
+    } catch (e: any) {
+        if (e.response?.data) {
+            throw e.response.data;
+        } else {
+            throw e;
+        }
+    }
+};
diff --git a/package.json b/package.json
index db0b127..5efb77c 100644
--- a/package.json
+++ b/package.json
@@ -2,9 +2,18 @@
   "name": "mpesa-node-api",
   "version": "1.1.0",
   "description": "Node.js library for M-Pesa API (Mozambique)",
-  "main": "index.js",
+  "main": "dist/index.js",
+  "types": "types/index.d.ts",
   "scripts": {
-    "test": "mocha"
+    "test": "mocha",
+    "build": "tsc"
+  },
+  "mocha": {
+    "require": "ts-node/register",
+    "extension": [
+      "ts"
+    ],
+    "spec": "test/**/*.ts"
   },
   "repository": {
     "type": "git",
@@ -20,13 +29,19 @@
   },
   "homepage": "https://github.com/rosariopfernandes/mpesa-node-api",
   "dependencies": {
-    "axios": "^0.21.1",
+    "axios": "^1.8.4",
     "constants": "0.0.2",
     "crypto": "^1.0.1",
     "dotenv": "^8.2.0"
   },
   "devDependencies": {
+    "@types/chai": "^5.2.1",
+    "@types/dotenv": "^6.1.1",
+    "@types/mocha": "^10.0.10",
+    "@types/node": "^22.13.14",
     "chai": "^4.2.0",
-    "mocha": "^8.0.1"
+    "mocha": "^11.1.0",
+    "ts-node": "^9.1.1",
+    "typescript": "^5.8.2"
   }
 }
diff --git a/test/test.js b/test/test.ts
similarity index 69%
rename from test/test.js
rename to test/test.ts
index db62f76..72e7fcd 100644
--- a/test/test.js
+++ b/test/test.ts
@@ -1,15 +1,16 @@
-const mpesa = require('../index');
-const expect = require('chai').expect;
+import * as mpesa from '../index';
+import { expect } from 'chai';
 
 describe('config', function () {
     it('initializeApi throws an error when required config is missing', function () {
         const actualConfig = {
             baseUrl: "api.mpesa.co.mz"
-        };
+        } as any;
+
         try {
-            mpesa.initializeApi(actualConfig)
+            mpesa.initializeApi(actualConfig);
         } catch (e) {
-            expect(e).to.equal('Please provide a valid apiKey in the configuration when calling initializeApi()')
+            expect(e).to.equal('Please provide a valid apiKey in the configuration when calling initializeApi()');
         }
     });
 
@@ -19,10 +20,11 @@ describe('config', function () {
             apiKey: "apiKey",
             publicKey: "key",
             origin: "developer.mpesa.co.mz",
-            serviceProviderCode: 171717
+            serviceProviderCode: "171717"
         };
+
         expect(function () {
-            mpesa.initializeApi(actualConfig)
+            mpesa.initializeApi(actualConfig);
         }).to.not.throw();
     });
 });
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..94e0849
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "module": "nodenext",
+    "moduleResolution": "nodenext",
+    "target": "esnext", 
+    "declaration": true, 
+    "declarationDir": "./types",
+    "outDir": "./dist",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "resolveJsonModule": true,
+    "sourceMap": true,
+    "types": ["mocha", "chai"],
+  },
+  "include": ["**/*.ts"],
+  "exclude": [
+    "node_modules"
+  ]
+}