diff --git a/src/services/keyManagement/__tests__/apiSercice.test.ts b/src/services/keyManagement/__tests__/apiSercice.test.ts
new file mode 100644
index 0000000..99bfd6b
--- /dev/null
+++ b/src/services/keyManagement/__tests__/apiSercice.test.ts
@@ -0,0 +1,65 @@
+import axios from "axios";
+import MockAdapter from "axios-mock-adapter";
+import { sendOTP } from "../apiService";
+
+describe("sendOTP", () => {
+  let mock: MockAdapter; // Explicitly declare the type
+
+  beforeEach(() => {
+    mock = new MockAdapter(axios);
+  });
+
+  afterEach(() => {
+    mock.restore();
+  });
+
+  it("should send OTP successfully with valid inputs", async () => {
+    const fullPhoneNumber = "1234567890";
+    const jwtToken = "valid-token";
+
+    mock
+      .onPost("http://localhost:8080/api/registration")
+      .reply(200, { message: "OTP sent" });
+
+    const response = await sendOTP(fullPhoneNumber, jwtToken);
+
+    expect(response).toEqual({ message: "OTP sent" });
+  });
+
+  it("should throw an error when API responds with an error", async () => {
+    const fullPhoneNumber = "1234567890";
+    const jwtToken = "valid-token";
+
+    mock.onPost("http://localhost:8080/api/registration").reply(500);
+
+    await expect(sendOTP(fullPhoneNumber, jwtToken)).rejects.toThrow(
+      "Failed to send OTP",
+    );
+  });
+
+  it("should throw an error when an invalid JWT token is provided", async () => {
+    const fullPhoneNumber = "1234567890";
+    const jwtToken = "invalid-token";
+
+    mock.onPost("http://localhost:8080/api/registration").reply(401);
+
+    await expect(sendOTP(fullPhoneNumber, jwtToken)).rejects.toThrow(
+      "Failed to send OTP",
+    );
+  });
+
+  it("should handle empty phone number and JWT token", async () => {
+    await expect(sendOTP("", "")).rejects.toThrow("Failed to send OTP");
+  });
+
+  it("should handle network error", async () => {
+    const fullPhoneNumber = "1234567890";
+    const jwtToken = "valid-token";
+
+    mock.onPost("http://localhost:8080/api/registration").networkError();
+
+    await expect(sendOTP(fullPhoneNumber, jwtToken)).rejects.toThrow(
+      "Failed to send OTP",
+    );
+  });
+});
diff --git a/src/services/keyManagement/__tests__/jwtservice.test.ts b/src/services/keyManagement/__tests__/jwtservice.test.ts
index 13c056c..46155fe 100644
--- a/src/services/keyManagement/__tests__/jwtservice.test.ts
+++ b/src/services/keyManagement/__tests__/jwtservice.test.ts
@@ -17,11 +17,13 @@ describe("JWT Generation", () => {
     // Convert privateKey to JWK for use with generateJWT
     const privateKeyJWK = await jose.exportJWK(privateKey);
 
+    // Convert publicKey to JWK for verification
+    const publicKeyJWK = await jose.exportJWK(publicKey);
+
     // Step 3: Call  the generateJWT function
-    const jwt = await generateJWT(data, privateKeyJWK);
+    const jwt = await generateJWT(data, privateKeyJWK, publicKeyJWK);
 
     // Step 4: Verify the JWT signature and payload
-    const publicKeyJWK = await jose.exportJWK(publicKey); // Convert publicKey to JWK for verification
     const { payload } = await jose.jwtVerify(
       jwt,
       await jose.importJWK(publicKeyJWK, "ES256"),
diff --git a/src/services/keyManagement/apiService.ts b/src/services/keyManagement/apiService.ts
new file mode 100644
index 0000000..3f129b1
--- /dev/null
+++ b/src/services/keyManagement/apiService.ts
@@ -0,0 +1,27 @@
+import axios from "axios";
+export const sendOTP = async (fullPhoneNumber: string, jwtToken: string) => {
+  // Create the request object with both phone number and public key
+  const requestBody = {
+    phoneNumber: fullPhoneNumber,
+  };
+  const headers = {
+    "Content-Type": "application/json",
+    Authorization: `Bearer ${jwtToken}`,
+  };
+
+  try {
+    const response = await axios.post(
+      "http://localhost:8080/api/registration",
+      requestBody,
+      { headers },
+    );
+
+    // Log the response from the backend
+    console.log("Response from backend:", response.data);
+
+    return response.data;
+  } catch (error) {
+    console.error("Error sending OTP:", error);
+    throw new Error("Failed to send OTP");
+  }
+};
diff --git a/src/services/keyManagement/jwtService.ts b/src/services/keyManagement/jwtService.ts
index ca763a9..875e56e 100644
--- a/src/services/keyManagement/jwtService.ts
+++ b/src/services/keyManagement/jwtService.ts
@@ -8,6 +8,7 @@ function hashPayload(payload: string): string {
 export async function generateJWT(
   data: string,
   privateKeyJWK: jose.JWK,
+  publicKeyJWK: jose.JWK,
 ): Promise<string> {
   // Hash the payload
   const hashedPayload = hashPayload(data);
@@ -23,7 +24,11 @@ export async function generateJWT(
 
     // Sign the JWT with the private key
     const jwt = await new jose.SignJWT(jwtPayload)
-      .setProtectedHeader({ alg: "ES256" })
+      .setProtectedHeader({
+        typ: "JWT",
+        alg: "ES256",
+        jwk: publicKeyJWK,
+      })
       .sign(privateKey);
 
     return jwt;
diff --git a/src/services/keyManagement/registerService.ts b/src/services/keyManagement/registerService.ts
index ff19eb2..f75203d 100644
--- a/src/services/keyManagement/registerService.ts
+++ b/src/services/keyManagement/registerService.ts
@@ -1,6 +1,7 @@
 import { generateJWT } from "./jwtService";
 import storeKeyPair, { retrieveKeyPair } from "./storeKey";
 import checkKeyPairExists from "./checkKeyPairExists";
+import { sendOTP } from "./apiService";
 
 export async function sendOtpWithKeyManagement(
   phoneNumber: string,
@@ -20,8 +21,10 @@ export async function sendOtpWithKeyManagement(
     }
 
     // Generate JWT with the full phone number
-    jwtToken = await generateJWT(phoneNumber, privateKey);
-    console.log("Generated JWT:", jwtToken);
+    jwtToken = await generateJWT(phoneNumber, privateKey, publicKey);
+
+    // Send the JWT and phone number
+    await sendOTP(phoneNumber, jwtToken);
   } else {
     console.log("Key pair already exists. Skipping generation.");
   }
diff --git a/src/services/keyManagement/storeKey.ts b/src/services/keyManagement/storeKey.ts
index 846d088..8182cfe 100644
--- a/src/services/keyManagement/storeKey.ts
+++ b/src/services/keyManagement/storeKey.ts
@@ -1,14 +1,13 @@
-import storage from "./storageSetup";
-import generateKeyPair from "./generateKey";
+import storage from "./storageSetup"; // Import the initialized storage
+import generateKeyPair from "./generateKey"; // Import your existing key generation function
 
 // Function to store a key pair in IndexedDB
 export async function storeKeyPair() {
-  const { publicKey, privateKey, kid } = await generateKeyPair();
+  const { publicKey, privateKey } = await generateKeyPair();
 
   // Store both keys in a single record in IndexedDB
   await storage.insert("keys", {
     value: {
-      id: kid,
       pub: { ...publicKey },
       priv: { ...privateKey },
     },