diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..a58d9e0
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,33 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Mocha Tests",
+      "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
+      "args": [
+        "--reporter",
+        "dot",
+        "--slow",
+        "5000",
+        "--colors",
+        "${workspaceFolder}/test/**/*.spec.js",
+
+      ],
+      "internalConsoleOptions": "openOnSessionStart",
+      "skipFiles": [
+        "<node_internals>/**"
+      ]
+    },
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Launch Program",
+            "skipFiles": [
+                "<node_internals>/**"
+            ],
+            "program": "${workspaceFolder}/src/yourNodeIndex.js"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
index fe71f4c..10360b6 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2024 Sulu
+Copyright (c) 2024 Sulu Software Consultancy Ltd.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..e888d58
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1697 @@
+{
+  "name": "l402",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "l402",
+      "version": "0.1.0",
+      "license": "MIT",
+      "dependencies": {
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+        "@webbtc/webln-types": "^3.0.0",
+        "axios": "^1.6.8"
+      },
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+        "@types/mocha": "^10.0.6",
+        "@types/node": "^20.12.10",
+        "@types/sinon": "^17.0.3",
+        "chai": "^4.3.6",
+        "mocha": "^10.4.0",
+        "nock": "^13.5.4",
+        "sinon": "^17.0.1",
+        "ts-mocha": "^10.0.0",
+        "ts-node": "^10.9.2",
+        "typescript": "^5.4.5"
+      }
+    },
+    "node_modules/@cspotcode/source-map-support": {
+      "version": "0.8.1",
+      "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@jridgewell/trace-mapping": "0.3.9"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@getalby/sdk": {
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+      "resolved": "https://registry.npmjs.org/@getalby/sdk/-/sdk-3.5.0.tgz",
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+      "dependencies": {
+        "eventemitter3": "^5.0.1",
+        "nostr-tools": "^1.17.0"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "type": "lightning",
+        "url": "lightning:hello@getalby.com"
+      }
+    },
+    "node_modules/@jridgewell/resolve-uri": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
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+      "dev": true,
+      "engines": {
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+    "node_modules/@jridgewell/sourcemap-codec": {
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+    },
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+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.9.tgz",
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+        "@jridgewell/sourcemap-codec": "^1.4.10"
+      }
+    },
+    "node_modules/@noble/ciphers": {
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+      "resolved": "https://registry.npmjs.org/@noble/ciphers/-/ciphers-0.2.0.tgz",
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+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@noble/curves": {
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+      "resolved": "https://registry.npmjs.org/@noble/curves/-/curves-1.1.0.tgz",
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+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
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+    "node_modules/@noble/hashes": {
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+      "funding": [
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+          "type": "individual",
+          "url": "https://paulmillr.com/funding/"
+        }
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+    },
+    "node_modules/@scure/bip32": {
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+        "url": "https://paulmillr.com/funding/"
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..90c44e9
--- /dev/null
+++ b/package.json
@@ -0,0 +1,42 @@
+{
+  "name": "l402",
+  "version": "0.1.0",
+  "description": "L402 client and tools for Javascript.",
+  "main": "index.js",
+  "scripts": {
+    "build": "rm -rf dist/ && tsc",
+    "start": "node dist/index.js",
+    "dev": "ts-node src/index.ts",
+    "test": "npm run build && mocha test/**/*.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "github.com/sulusolutions/l402-ts"
+  },
+  "keywords": [
+    "L402",
+    "lightning",
+    "network",
+    "bitcoin"
+  ],
+  "author": "Samuel Alarco Cantos <samuel.alarco@sulusolutions.com>",
+  "license": "MIT",
+  "devDependencies": {
+    "@types/chai": "^4.3.16",
+    "@types/mocha": "^10.0.6",
+    "@types/node": "^20.12.10",
+    "@types/sinon": "^17.0.3",
+    "chai": "^4.3.6",
+    "mocha": "^10.4.0",
+    "nock": "^13.5.4",
+    "sinon": "^17.0.1",
+    "ts-mocha": "^10.0.0",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.4.5"
+  },
+  "dependencies": {
+    "@getalby/sdk": "^3.5.0",
+    "@webbtc/webln-types": "^3.0.0",
+    "axios": "^1.6.8"
+  }
+}
diff --git a/src/client/axios.ts b/src/client/axios.ts
new file mode 100644
index 0000000..17f0a6f
--- /dev/null
+++ b/src/client/axios.ts
@@ -0,0 +1,63 @@
+// Import necessary dependencies
+import axios, { AxiosInstance, InternalAxiosRequestConfig, AxiosResponse, AxiosError } from 'axios';
+import { Wallet, PaymentResult, Store } from '../index'; 
+
+// Define the interceptor function
+export function setupL402Interceptor(instance: AxiosInstance, wallet: Wallet, store: Store): void {
+  // Request interceptor to set an authorization header if a token is available
+instance.interceptors.request.use((config: InternalAxiosRequestConfig<any>) => {
+    const token = store.get(config.url || '');
+    if (token) {
+        config.headers["Authorization"] =  `${token}`;
+    }
+    return config;
+});
+
+  // Response interceptor to handle the 402 Payment Required status
+  instance.interceptors.response.use(
+    (response: AxiosResponse) => response, // Successful responses pass through unchanged
+    async (error) => {
+      if (axios.isAxiosError(error) && error.config && error.response && error.response.status === 402) {
+        // Extract the challenge details from the WWW-Authenticate header
+        const authHeader = error.response.headers['www-authenticate'] || '';
+        const challenge = parseHeader(authHeader);
+
+        if (challenge && challenge.invoice) {
+          // Pay the invoice using the provided Wallet
+          const paymentResult: PaymentResult = await wallet.payInvoice(challenge.invoice);
+
+          if (paymentResult.success) {
+            // Create a new L402 token and store it
+            const l402Token = `${challenge.header_key} ${challenge.macaroon}:${paymentResult.preimage}`;
+            store.put(error.config.url || '', l402Token);
+
+            // Retry the request with the new token
+            error.config.headers["Authorization"] = l402Token;
+            return instance.request(error.config); // Retry the request
+          }
+        }
+      }
+
+      // If not a 402 error or payment was not successful, reject the promise
+      return Promise.reject(error);
+    }
+  );
+}
+
+// Function to parse the WWW-Authenticate header
+function parseHeader(header: string): { header_key: string; invoice: string; macaroon: string } | null {
+  const headerKeyMatch = /^(LSAT|L402)/.exec(header);
+  const invoiceMatch = /invoice="([^"]+)"/.exec(header);
+  const macaroonMatch = /macaroon="([^"]+)"/.exec(header);
+
+  if (invoiceMatch && macaroonMatch) {
+    return {
+      header_key: headerKeyMatch ? headerKeyMatch[0] : '',
+      invoice: invoiceMatch[1],
+      macaroon: macaroonMatch[1],
+    };
+  }
+
+  return null;
+}
+
diff --git a/src/client/index.ts b/src/client/index.ts
new file mode 100644
index 0000000..0e52333
--- /dev/null
+++ b/src/client/index.ts
@@ -0,0 +1 @@
+export {setupL402Interceptor} from './axios';
\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..8271f11
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,7 @@
+// src/index.ts
+export { Store, MemoryTokenStore} from './tokenstore/tokenStore';
+
+export { AlbyWallet } from './wallet/alby';
+export { Wallet, PaymentResult } from './wallet/wallet';
+
+export { setupL402Interceptor } from './client';
diff --git a/src/tokenstore/tokenStore.ts b/src/tokenstore/tokenStore.ts
new file mode 100644
index 0000000..d825224
--- /dev/null
+++ b/src/tokenstore/tokenStore.ts
@@ -0,0 +1,77 @@
+// token_store.ts
+
+// Abstract class representing the Store interface
+export abstract class Store {
+    /**
+     * Saves a token against a specified host and path.
+     * @param url URL string to associate with the token
+     * @param token The token string to store
+     */
+    abstract put(url: string, token: string): void;
+
+    /**
+     * Looks for a token that matches the given host and path.
+     * Returns the most relevant token if available, or null otherwise.
+     * @param url URL string to search for a token
+     * @returns The token found or null if none matches
+     */
+    abstract get(url: string): string | null;
+
+    /**
+     * Removes a token that matches the given host and path.
+     * @param url URL string to remove its associated token
+     * @returns True if a token was removed, otherwise false
+     */
+    abstract delete(url: string): boolean;
+}
+
+// Concrete implementation of the Store using an in-memory structure
+export class MemoryTokenStore extends Store {
+    // Store tokens in a map, using a (host, path) tuple as the key
+    private tokens = new Map<string, string>();
+
+    /**
+     * Converts a (hostname, path) tuple to a single string key.
+     * @param hostname The hostname
+     * @param path The URL path
+     * @returns A combined string key
+     */
+    private static generateKey(hostname: string | null, path: string): string {
+        return `${hostname || 'null'}:${path}`;
+    }
+
+    // Save the token in the map using the parsed hostname and path
+    put(urlStr: string, token: string): void {
+        try {
+            const parsedUrl = new URL(urlStr);
+            const key = MemoryTokenStore.generateKey(parsedUrl.hostname, parsedUrl.pathname);
+            this.tokens.set(key, token);
+        } catch (e) {
+            console.error(`Invalid URL: ${urlStr}`);
+        }
+    }
+
+    // Retrieve the token if available or return null
+    get(urlStr: string): string | null {
+        try {
+            const parsedUrl = new URL(urlStr);
+            const key = MemoryTokenStore.generateKey(parsedUrl.hostname, parsedUrl.pathname);
+            return this.tokens.get(key) || null;
+        } catch (e) {
+            console.error(`Invalid URL: ${urlStr}`);
+            return null;
+        }
+    }
+
+    // Remove the token if the URL's hostname and path match any stored key
+    delete(urlStr: string): boolean {
+        try {
+            const parsedUrl = new URL(urlStr);
+            const key = MemoryTokenStore.generateKey(parsedUrl.hostname, parsedUrl.pathname);
+            return this.tokens.delete(key);
+        } catch (e) {
+            console.error(`Invalid URL: ${urlStr}`);
+            return false;
+        }
+    }
+}
diff --git a/src/wallet/alby.ts b/src/wallet/alby.ts
new file mode 100644
index 0000000..3154942
--- /dev/null
+++ b/src/wallet/alby.ts
@@ -0,0 +1,35 @@
+// Assuming the Wallet and PaymentResult classes are in a file named `wallet.ts`
+// Import the abstract Wallet class and PaymentResult
+import { Wallet, PaymentResult } from './wallet';
+
+// Import the Client class from the Alby SDK
+import { Client } from '@getalby/sdk';
+import { SendPaymentResponse } from '@getalby/sdk/dist/types';
+
+export class AlbyWallet extends Wallet {
+    private client: Client;
+  
+    // Accept a pre-configured Alby Client object in the constructor
+    constructor(client: Client) {
+      super();
+      // Assign the provided client to the local property
+      this.client = client;
+    }
+  
+    // Implement the abstract payInvoice method
+    async payInvoice(invoice: string): Promise<PaymentResult> {
+      try {
+        // Use the Alby SDK to send the payment
+        const response: SendPaymentResponse = await this.client.sendPayment({
+          invoice: invoice,
+        });
+  
+        // If successful, return the preimage and success status
+        return new PaymentResult(response.payment_preimage || '', true);
+      } catch (error) {
+        // In case of errors, return a PaymentResult with an error message
+        const errorMessage = error instanceof Error ? error.message : String(error);
+        return new PaymentResult('', false, errorMessage);
+      }
+    }
+  }
\ No newline at end of file
diff --git a/src/wallet/index.ts b/src/wallet/index.ts
new file mode 100644
index 0000000..49d415e
--- /dev/null
+++ b/src/wallet/index.ts
@@ -0,0 +1,2 @@
+export {AlbyWallet} from './alby';
+export {Wallet} from './wallet';
\ No newline at end of file
diff --git a/src/wallet/wallet.ts b/src/wallet/wallet.ts
new file mode 100644
index 0000000..90713d5
--- /dev/null
+++ b/src/wallet/wallet.ts
@@ -0,0 +1,34 @@
+export class PaymentResult {
+    preimage: string;
+    success: boolean;
+    error?: string;
+
+    constructor(preimage: string, success: boolean, error?: string) {
+        this.preimage = preimage;
+        this.success = success;
+        this.error = error;
+    }
+}
+
+export abstract class Wallet {
+    /**
+     * Attempts to pay the given invoice and returns the result.
+     * Should handle necessary logic like decoding the invoice, making the payment through the wallet's API,
+     * and returning the preimage if successful.
+     */
+    abstract payInvoice(invoice: string): Promise<PaymentResult>;
+}
+
+// Mock implementation of a Wallet
+class MockWallet extends Wallet {
+    // Mock implementation of payInvoice for demonstration purposes
+    async payInvoice(invoice: string): Promise<PaymentResult> {
+        if (invoice === "valid-invoice") {
+            // Example successful result
+            return new PaymentResult("example-preimage", true);
+        } else {
+            // Example failure result
+            return new PaymentResult("", false, "Invalid invoice");
+        }
+    }
+}
\ No newline at end of file
diff --git a/test/client/axios.spec.js b/test/client/axios.spec.js
new file mode 100644
index 0000000..f0b3f9c
--- /dev/null
+++ b/test/client/axios.spec.js
@@ -0,0 +1,89 @@
+// test/l402Interceptor.test.js
+const { expect } = require('chai');
+const nock = require('nock');
+const axios = require('axios');
+const { setupL402Interceptor } = require('../../dist');
+const { Wallet, Store, PaymentResult } = require('../../dist');
+
+// Mock classes to simulate Wallet and Store
+class MockWallet extends Wallet {
+    payInvoice(invoice) {
+      // Simulate successful payment with a known preimage
+      return new PaymentResult('mock-preimage', true);
+    }
+  }
+  
+  class MockStore extends Store {
+    constructor() {
+      super();
+      this.tokens = {};
+    }
+  
+    put(url, token) {
+      this.tokens[url] = token;
+    }
+  
+    get(url) {
+      return this.tokens[url] || null;
+    }
+  }
+  
+  describe('L402 Interceptor', () => {
+    let instance;
+    let wallet;
+    let store;
+  
+    beforeEach(() => {
+      // Create a new Axios instance
+      instance = axios.create();
+  
+      // Initialize the mocked wallet and store
+      wallet = new MockWallet();
+      store = new MockStore();
+  
+      // Set up the interceptor
+      setupL402Interceptor(instance, wallet, store);
+    });
+  
+    afterEach(() => {
+      // Clean up all nock interceptors after each test
+      nock.cleanAll();
+    });
+  
+    it('should set an Authorization header with the stored token', async () => {
+      // Arrange: Add a token to the store
+      const url = 'https://example.com/resource';
+      store.put(url, 'mock-token');
+  
+      // Mock the HTTP request to return a 200 response
+      nock('https://example.com')
+        .get('/resource')
+        .reply(200, 'response data');
+  
+      // Act: Make a GET request
+      const response = await instance.get(url);
+  
+      // Assert: Verify the stored token was used
+      expect(response.config.headers['Authorization']).to.equal('mock-token');
+    });
+  
+    it('should retry a request after paying an invoice', async () => {
+      // Arrange: Mock the 402 response with a WWW-Authenticate header
+      const url = 'https://example.com/resource';
+      nock('https://example.com')
+        .get('/resource')
+        .reply(402, '', { 'www-authenticate': 'L402 invoice="mock-invoice" macaroon="mock-macaroon"' });
+  
+      // Mock the successful retry response
+      nock('https://example.com')
+        .get('/resource')
+        .reply(200, 'response data');
+  
+      // Act: Make a GET request and handle the retry logic
+      const response = await instance.get(url);
+  
+      // Assert: Verify that the Authorization header was set with the new L402 token
+      expect(response.config.headers['Authorization']).to.include('L402');
+      expect(response.config.headers['Authorization']).to.include('mock-preimage');
+    });
+  });
\ No newline at end of file
diff --git a/test/tokenstore/tokenStore.spec.js b/test/tokenstore/tokenStore.spec.js
new file mode 100644
index 0000000..fb2eba6
--- /dev/null
+++ b/test/tokenstore/tokenStore.spec.js
@@ -0,0 +1,55 @@
+const { expect } = require('chai');
+const { MemoryTokenStore } = require('../../dist');
+
+describe('MemoryTokenStore', () => {
+  let store;
+
+  // Initialize a new store instance before each test
+  beforeEach(() => {
+    store = new MemoryTokenStore();
+  });
+
+  it('should store and retrieve a token by URL', () => {
+    const url = 'https://example.com/api';
+    const token = 'example-token';
+
+    // Store the token in the memory store
+    store.put(url, token);
+
+    // Retrieve the token and verify it matches the original
+    const retrievedToken = store.get(url);
+    expect(retrievedToken).to.equal(token);
+  });
+
+  it('should return null for a non-existent URL', () => {
+    const nonExistentUrl = 'https://example.com/non-existent';
+
+    // Attempt to retrieve a token for a URL that wasn't stored
+    const result = store.get(nonExistentUrl);
+    expect(result).to.be.null;
+  });
+
+  it('should delete a token by URL', () => {
+    const url = 'https://example.com/api';
+    const token = 'example-token';
+
+    // Store the token in the memory store
+    store.put(url, token);
+
+    // Delete the stored token
+    const wasDeleted = store.delete(url);
+    expect(wasDeleted).to.be.true;
+
+    // Verify that the token no longer exists
+    const result = store.get(url);
+    expect(result).to.be.null;
+  });
+
+  it('should return false when deleting a non-existent URL', () => {
+    const nonExistentUrl = 'https://example.com/non-existent';
+
+    // Attempt to delete a token for a URL that wasn't stored
+    const wasDeleted = store.delete(nonExistentUrl);
+    expect(wasDeleted).to.be.false;
+  });
+});
diff --git a/test/wallet/alby.spec.js b/test/wallet/alby.spec.js
new file mode 100644
index 0000000..7257800
--- /dev/null
+++ b/test/wallet/alby.spec.js
@@ -0,0 +1,55 @@
+// test/albyWallet.test.js
+const { expect } = require('chai');
+const sinon = require('sinon');
+
+// Import the AlbyWallet and PaymentResult classes
+const { AlbyWallet } = require('../../dist');
+const { PaymentResult } = require('../../dist');
+
+// Import the Alby Client class
+const { Client } = require('@getalby/sdk');
+
+describe('AlbyWallet', () => {
+  let mockClient;
+  let wallet;
+
+  beforeEach(() => {
+    // Create a mock client instance
+    mockClient = sinon.createStubInstance(Client);
+
+    // Initialize the AlbyWallet instance with the mocked client
+    wallet = new AlbyWallet(mockClient);
+  });
+
+  it('should successfully pay an invoice', async () => {
+    // Arrange: Mock the sendPayment method to return a successful payment response
+    const mockResponse = {
+      payment_preimage: 'example-preimage',
+    };
+    mockClient.sendPayment.resolves(mockResponse);
+
+    // Act: Call the payInvoice method
+    const result = await wallet.payInvoice('example-invoice');
+
+    // Assert: Validate the PaymentResult
+    expect(result).to.be.an.instanceOf(PaymentResult);
+    expect(result.success).to.be.true;
+    expect(result.preimage).to.equal('example-preimage');
+    expect(result.error).to.be.undefined;
+  });
+
+  it('should handle payment errors gracefully', async () => {
+    // Arrange: Mock the sendPayment method to reject with an error
+    const error = new Error('Payment failed');
+    mockClient.sendPayment.rejects(error);
+
+    // Act: Call the payInvoice method
+    const result = await wallet.payInvoice('example-invoice');
+
+    // Assert: Validate the PaymentResult
+    expect(result).to.be.an.instanceOf(PaymentResult);
+    expect(result.success).to.be.false;
+    expect(result.preimage).to.be.empty;
+    expect(result.error).to.equal('Payment failed');
+  });
+});
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..f41d133
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "module": "CommonJS",
+    "moduleResolution": "node",
+    "target": "ES2020",
+    "outDir": "dist",
+    "strict": true,
+    "esModuleInterop": true,
+    "noImplicitAny": true,    // Specifically catches missing type annotations
+    "pretty": false,
+    "removeComments": true,
+    "sourceMap": true,
+    "declaration": true,
+    "declarationMap": true,
+  },
+  "include": ["src/**/*"],
+  "exclude": [
+    "node_modules",
+    "**/node_modules/*"
+  ]
+
+}
\ No newline at end of file