diff --git a/ballerina/annotation.bal b/ballerina/annotation.bal
index 7e17e0d9..1ee06ddc 100644
--- a/ballerina/annotation.bal
+++ b/ballerina/annotation.bal
@@ -25,8 +25,8 @@
 # + unsubscribeOnShutdown - This flag notifies whether or not to initiate unsubscription when the service is shutting down
 # + httpConfig - The configuration for the subscriber client used to interact with the discovered/specified hub
 # + discoveryConfig - HTTP client configurations for resource discovery
-# + customParams - Additional parameters, which need to be sent with the subscription request
-# + customHeaders - Additional HTTP headers, which need to be sent with the subscription request
+# + customParams - Additional parameters, which need to be sent with the subscription/unsubscription request
+# + customHeaders - Additional HTTP headers, which need to be sent with the subscription/unsubscription request
 # + servicePath - The generated service-path if the service-path is not provided. This is auto-generated at the compile-time.
 public type SubscriberServiceConfiguration record {|
     string|[string, string] target?;
diff --git a/ballerina/subscriber_client.bal b/ballerina/subscriber_client.bal
index a9b91cc4..08f8c9fd 100644
--- a/ballerina/subscriber_client.bal
+++ b/ballerina/subscriber_client.bal
@@ -64,7 +64,8 @@ public isolated client class SubscriptionClient {
             returns SubscriptionChangeResponse|SubscriptionInitiationError {
         http:Client httpClient = self.httpClient;
         SubscriptionPayload payload = buildSubscriptionPayload(MODE_UNSUBSCRIBE, unsubscriptionRequest);
-        http:Response|error response = httpClient->post("", payload, mediaType = mime:APPLICATION_FORM_URLENCODED);
+        http:Response|error response = httpClient->post("", payload, 
+            headers = unsubscriptionRequest.customHeaders, mediaType = mime:APPLICATION_FORM_URLENCODED);
         return processHubResponse(self.url, MODE_UNSUBSCRIBE, unsubscriptionRequest.topic, response);
     }
 
@@ -91,11 +92,11 @@ isolated function buildSubscriptionPayload(string mode, SubscriptionChangeReques
         if subscriptionReq.leaseSeconds != 0 {
             payload.hub\.lease_seconds = subscriptionReq.leaseSeconds.toString();
         }
-        map<string>? customParams = subscriptionReq.customParams;
-        if customParams is map<string> {
-            foreach var ['key, value] in customParams.entries() {
-                payload['key] = value;
-            }
+    }
+    map<string>? customParams = subscriptionReq.customParams;
+    if customParams is map<string> {
+        foreach var ['key, value] in customParams.entries() {
+            payload['key] = value;
         }
     }
     return payload;
diff --git a/ballerina/tests/subscription_initiation_test.bal b/ballerina/tests/subscription_initiation_test.bal
index 3dcda463..d494f289 100644
--- a/ballerina/tests/subscription_initiation_test.bal
+++ b/ballerina/tests/subscription_initiation_test.bal
@@ -56,17 +56,6 @@ service /common on new http:Listener(9192) {
         }
         check caller->respond();
     }
-
-    isolated resource function post hub/additional/unsub(http:Caller caller, http:Request request) returns error? {
-        map<string> params = check request.getFormParams();
-        foreach var ['key, _] in self.expectedAdditionalParams {
-            test:assertTrue(!params.hasKey('key), "unexpected additional parameter present");
-        }
-        foreach var [header, _] in self.expectedAdditionalHeaders {
-            test:assertTrue(!request.hasHeader(header), "unexpected additional header present");
-        }
-        check caller->respond();
-    }
 }
 
 isolated function getServiceAnnotationConfig(string|[string, string] target) returns SubscriberServiceConfiguration {
@@ -239,7 +228,7 @@ isolated function testUnSubscriptionInitiationDisable() returns error? {
 }
 isolated function testUnSubscriptionInitiationSuccessWithAdditionalParams() returns error? {
     SubscriberServiceConfiguration config = {
-        target: ["http://127.0.0.1:9192/common/hub/additional/unsub", COMMON_TOPIC],
+        target: ["http://127.0.0.1:9192/common/hub/additional", COMMON_TOPIC],
         leaseSeconds: 36000,
         callback: CALLBACK,
         unsubscribeOnShutdown: true
diff --git a/docs/spec/spec.md b/docs/spec/spec.md
index 823c9a97..e47ddf41 100644
--- a/docs/spec/spec.md
+++ b/docs/spec/spec.md
@@ -280,8 +280,8 @@ should be `websub:SubscriberServiceConfig` a service-level-annotation for `websu
 # + unsubscribeOnShutdown - This flag notifies whether or not to initiate unsubscription when the service is shutting down
 # + httpConfig - The configuration for the subscriber client used to interact with the discovered/specified hub
 # + discoveryConfig - HTTP client configurations for resource discovery
-# + customParams - Additional parameters, which need to be sent with the subscription request
-# + customHeaders - Additional HTTP headers, which need to be sent with the subscription request
+# + customParams - Additional parameters, which need to be sent with the subscription/unsubscription request
+# + customHeaders - Additional HTTP headers, which need to be sent with the subscription/unsubscription request
 # + servicePath - The generated service-path if the service-path is not provided. This is auto-generated at the compile-time
 public type SubscriberServiceConfiguration record {|
     string|[string, string] target?;