diff --git a/.github/workflows/daily-build.yml b/.github/workflows/daily-build.yml
index 9314a7d..46c3568 100644
--- a/.github/workflows/daily-build.yml
+++ b/.github/workflows/daily-build.yml
@@ -4,6 +4,9 @@ on:
   schedule:
     - cron:  '0 */12 * * *'
 
+env:
+  BALLERINA_VERSION: 2201.8.4    # Update this with the latest Ballerina version
+
 jobs:
   build:
     if: github.repository_owner == 'ballerina-guides'
@@ -23,7 +26,7 @@ jobs:
     - uses: ballerina-platform/setup-ballerina@v1
       name: Install Ballerina
       with:
-        version: 2201.2.3
+        version: ${{ env.BALLERINA_VERSION }}
     - name: Pack gRPC Stub Module
       working-directory: "client_stubs"
       run: bal pack
diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index 99e5b4c..d25f679 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -6,6 +6,9 @@ on:
     branches-ignore:
       - master
 
+env:
+  BALLERINA_VERSION: 2201.8.4    # Update this with the latest Ballerina version
+
 jobs:
   build:
     if: github.repository_owner == 'ballerina-guides'
@@ -25,7 +28,7 @@ jobs:
     - uses: ballerina-platform/setup-ballerina@v1
       name: Install Ballerina
       with:
-        version: 2201.2.3
+        version: ${{ env.BALLERINA_VERSION }}
     - name: Pack gRPC Stub Module
       working-directory: "client_stubs"
       run: bal pack
diff --git a/adservice/docker/Config.toml b/adservice/docker/Config.toml
index d03bdd8..abf282a 100644
--- a/adservice/docker/Config.toml
+++ b/adservice/docker/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/adservice/k8s/Config.toml b/adservice/k8s/Config.toml
index d03bdd8..abf282a 100644
--- a/adservice/k8s/Config.toml
+++ b/adservice/k8s/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/cartservice/docker/Config.toml b/cartservice/docker/Config.toml
index 7ff56a5..abf282a 100644
--- a/cartservice/docker/Config.toml
+++ b/cartservice/docker/Config.toml
@@ -2,10 +2,6 @@
 tracingEnabled=true
 tracingProvider="jaeger"
 
-[ballerinax.jaeger] 
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+[ballerinax.jaeger]
+agentHostname="localhost"
+agentPort=4317
diff --git a/cartservice/k8s/Config.toml b/cartservice/k8s/Config.toml
index d03bdd8..abf282a 100644
--- a/cartservice/k8s/Config.toml
+++ b/cartservice/k8s/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/checkoutservice/docker/Config.toml b/checkoutservice/docker/Config.toml
index 9ad48f3..56870fb 100644
--- a/checkoutservice/docker/Config.toml
+++ b/checkoutservice/docker/Config.toml
@@ -10,9 +10,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/checkoutservice/k8s/Config.toml b/checkoutservice/k8s/Config.toml
index ac02a3d..c2c3e99 100644
--- a/checkoutservice/k8s/Config.toml
+++ b/checkoutservice/k8s/Config.toml
@@ -16,9 +16,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/client_stubs/docker/Config.toml b/client_stubs/docker/Config.toml
new file mode 100644
index 0000000..56870fb
--- /dev/null
+++ b/client_stubs/docker/Config.toml
@@ -0,0 +1,14 @@
+catalogHost="catalog"
+cartHost="cart"
+currencyHost="currency"
+shippingHost="shipping"
+paymentHost="payment"
+emailHost="email"
+
+[ballerina.observe]
+tracingEnabled=true
+tracingProvider="jaeger"
+
+[ballerinax.jaeger]
+agentHostname="localhost"
+agentPort=4317
diff --git a/client_stubs/k8s/Config.toml b/client_stubs/k8s/Config.toml
new file mode 100644
index 0000000..c2c3e99
--- /dev/null
+++ b/client_stubs/k8s/Config.toml
@@ -0,0 +1,20 @@
+catalogHost="catalog-service" 
+cartHost="cart-service" 
+currencyHost="currency-service" 
+shippingHost="shipping-service" 
+paymentHost="payment-service" 
+emailHost="email-service"
+cartTimeout=3.0
+catalogTimeout=3.0
+currencyTimeout=3.0
+shippingTimeout=3.0
+paymentTimeout=3.0
+emailTimeout=3.0
+
+[ballerina.observe]
+tracingEnabled=true
+tracingProvider="jaeger"
+
+[ballerinax.jaeger]
+agentHostname="localhost"
+agentPort=4317
diff --git a/currencyservice/docker/Config.toml b/currencyservice/docker/Config.toml
index d03bdd8..abf282a 100644
--- a/currencyservice/docker/Config.toml
+++ b/currencyservice/docker/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/currencyservice/k8s/Config.toml b/currencyservice/k8s/Config.toml
index d03bdd8..abf282a 100644
--- a/currencyservice/k8s/Config.toml
+++ b/currencyservice/k8s/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/docker-compose.yml b/docker-compose.yml
index e9a7abe..4c967b4 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -6,7 +6,7 @@ services:
     ports:
       - 16686:16686
       - 13133:13133
-      - 55680:55680
+      - 4317:4317
   ads:
     image: wso2inc/ads-service:v0.1.0
     volumes:
diff --git a/emailservice/ObserveConfig.toml b/emailservice/ObserveConfig.toml
index d03bdd8..abf282a 100644
--- a/emailservice/ObserveConfig.toml
+++ b/emailservice/ObserveConfig.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/emailservice/docker/Config.toml b/emailservice/docker/Config.toml
new file mode 100644
index 0000000..56870fb
--- /dev/null
+++ b/emailservice/docker/Config.toml
@@ -0,0 +1,14 @@
+catalogHost="catalog"
+cartHost="cart"
+currencyHost="currency"
+shippingHost="shipping"
+paymentHost="payment"
+emailHost="email"
+
+[ballerina.observe]
+tracingEnabled=true
+tracingProvider="jaeger"
+
+[ballerinax.jaeger]
+agentHostname="localhost"
+agentPort=4317
diff --git a/emailservice/email_service.bal b/emailservice/email_service.bal
index 73fe777..d11c183 100644
--- a/emailservice/email_service.bal
+++ b/emailservice/email_service.bal
@@ -43,14 +43,16 @@ service "EmailService" on new grpc:Listener(9097) {
     private final gmail:Client gmailClient;
 
     function init() returns error? {
-        self.gmailClient = check new ({
-            auth: {
-                refreshUrl: gmail:REFRESH_URL,
-                refreshToken: gmailConfig.refreshToken,
-                clientId: gmailConfig.clientId,
-                clientSecret: gmailConfig.clientSecret
+        self.gmailClient = check new gmail:Client(
+            config = {
+                auth: {
+                    refreshToken: gmailConfig.refreshToken,
+                    clientId: gmailConfig.clientId,
+                    clientSecret: gmailConfig.clientSecret
+                }
             }
-        });
+        );
+
         log:printInfo("Email service gRPC server started.");
     }
 
@@ -62,12 +64,11 @@ service "EmailService" on new grpc:Listener(9097) {
         log:printInfo(string `Received a request to send order confirmation email to ${request.email}.`);
 
         gmail:MessageRequest messageRequest = {
-            recipient: request.email,
+            to: [request.email],
             subject: "Your Confirmation Email",
-            messageBody: (check getConfirmationHtml(request.'order)).toString(),
-            contentType: gmail:TEXT_HTML
+            bodyInHtml: (check getConfirmationHtml(request.'order)).toString()
         };
-        gmail:Message|error sendMessageResponse = self.gmailClient->sendMessage(messageRequest);
+        gmail:Message|error sendMessageResponse = check self.gmailClient->/users/[request.email]/messages/send.post(messageRequest);
         if sendMessageResponse is error {
             log:printError("An error occurred when sending the order confirmation email ", sendMessageResponse);
             return sendMessageResponse;
diff --git a/emailservice/k8s/Config.toml b/emailservice/k8s/Config.toml
index d03bdd8..abf282a 100644
--- a/emailservice/k8s/Config.toml
+++ b/emailservice/k8s/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/frontend/README.md b/frontend/README.md
index ee59a78..0294cbc 100644
--- a/frontend/README.md
+++ b/frontend/README.md
@@ -31,11 +31,13 @@ AuthInterceptor authInterceptor = new;
     cors: {
         allowOrigins: ["http://localhost:3000"],
         allowCredentials: true
-    },
-    interceptors: [new AuthInterceptor()]
+    }
 }
-service / on new http:Listener (9098) {
+service http:InterceptableService / on new http:Listener (9098) {
 
+    public function createInterceptors() returns AuthInterceptor {
+        return authInterceptor;
+    }
 }
 ```
 
diff --git a/frontend/docker/Config.toml b/frontend/docker/Config.toml
index b403517..d34b451 100644
--- a/frontend/docker/Config.toml
+++ b/frontend/docker/Config.toml
@@ -11,9 +11,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/frontend/k8s/Config.toml b/frontend/k8s/Config.toml
index d6bcd45..f5952bc 100644
--- a/frontend/k8s/Config.toml
+++ b/frontend/k8s/Config.toml
@@ -18,9 +18,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/frontend/service.bal b/frontend/service.bal
index fe7f218..91fa6ba 100644
--- a/frontend/service.bal
+++ b/frontend/service.bal
@@ -64,14 +64,13 @@ service class AuthInterceptor {
     cors: {
         allowOrigins: ["http://localhost:3000"],
         allowCredentials: true
-    },
-    interceptors: [new AuthInterceptor()]
+    }
 }
 @display {
     label: "Frontend",
     id: "frontend"
 }
-service / on new http:Listener(9098) {
+service http:InterceptableService / on new http:Listener(9098) {
 
     function init() {
         log:printInfo("Frontend server started.");
@@ -370,4 +369,8 @@ service / on new http:Listener(9098) {
         return from stubs:CartItem {product_id} in cart.items
             select product_id;
     }
+
+    public function createInterceptors() returns AuthInterceptor {
+        return new AuthInterceptor();
+    }
 }
diff --git a/paymentservice/docker/Config.toml b/paymentservice/docker/Config.toml
index d03bdd8..abf282a 100644
--- a/paymentservice/docker/Config.toml
+++ b/paymentservice/docker/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/paymentservice/k8s/Config.toml b/paymentservice/k8s/Config.toml
index d03bdd8..abf282a 100644
--- a/paymentservice/k8s/Config.toml
+++ b/paymentservice/k8s/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/productcatalogservice/docker/Config.toml b/productcatalogservice/docker/Config.toml
index d03bdd8..abf282a 100644
--- a/productcatalogservice/docker/Config.toml
+++ b/productcatalogservice/docker/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/productcatalogservice/k8s/Config.toml b/productcatalogservice/k8s/Config.toml
index d03bdd8..abf282a 100644
--- a/productcatalogservice/k8s/Config.toml
+++ b/productcatalogservice/k8s/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/recommendationservice/docker/Config.toml b/recommendationservice/docker/Config.toml
index 0cacf8b..2b2f487 100644
--- a/recommendationservice/docker/Config.toml
+++ b/recommendationservice/docker/Config.toml
@@ -5,9 +5,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/recommendationservice/k8s/Config.toml b/recommendationservice/k8s/Config.toml
index 2f1b026..fa026c0 100644
--- a/recommendationservice/k8s/Config.toml
+++ b/recommendationservice/k8s/Config.toml
@@ -6,9 +6,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/shippingservice/docker/Config.toml b/shippingservice/docker/Config.toml
index d03bdd8..abf282a 100644
--- a/shippingservice/docker/Config.toml
+++ b/shippingservice/docker/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317
diff --git a/shippingservice/k8s/Config.toml b/shippingservice/k8s/Config.toml
index d03bdd8..abf282a 100644
--- a/shippingservice/k8s/Config.toml
+++ b/shippingservice/k8s/Config.toml
@@ -3,9 +3,5 @@ tracingEnabled=true
 tracingProvider="jaeger"
 
 [ballerinax.jaeger]
-agentHostname="jaeger"
-agentPort=55680
-samplerType="const"
-samplerParam=1.0
-reporterFlushInterval=2000
-reporterBufferSize=1000
+agentHostname="localhost"
+agentPort=4317