diff --git a/lib/convertkit_v4/client/custom_fields.rb b/lib/convertkit_v4/client/custom_fields.rb
index f7a5498..84ca5ac 100644
--- a/lib/convertkit_v4/client/custom_fields.rb
+++ b/lib/convertkit_v4/client/custom_fields.rb
@@ -6,9 +6,11 @@ def custom_fields
         connection.get("custom_fields").body["custom_fields"]
       end
 
-      def add_custom_field(options = {})
+      def add_custom_field(label)
         connection.post("custom_fields") do |f|
-          f.params['label'] = options[:label]
+          f.body = JSON.generate({
+            label: label
+          })
         end
       end
 
@@ -16,9 +18,11 @@ def delete_custom_field(custom_field_id)
         connection.delete("custom_fields/#{custom_field_id}")
       end
 
-      def update_custom_field(custom_field_id, options = {})
+      def update_custom_field(custom_field_id, label)
         connection.put("custom_fields/#{custom_field_id}") do |f|
-          f.params['label'] = options[:label]
+          f.body = JSON.generate({
+            label: label
+          })
         end
       end
 
diff --git a/lib/convertkit_v4/client/subscribers.rb b/lib/convertkit_v4/client/subscribers.rb
index 64f66db..e96dbe1 100644
--- a/lib/convertkit_v4/client/subscribers.rb
+++ b/lib/convertkit_v4/client/subscribers.rb
@@ -1,6 +1,7 @@
 module ConvertkitV4
   class Client
     module Subscribers
+
       def subscribers(options = {})
         connection.get("subscribers", options)
       end
@@ -9,27 +10,42 @@ def subscriber(subscriber_id)
         connection.get("subscribers/#{subscriber_id}")
       end
 
-      def subscriber_tags(subscriber_id)
-        connection.get("subscribers/#{subscriber_id}/tags")
+      def add_subscriber(email_address, options = {})
+        response = connection.post("subscribers") do |f|
+          body = {
+            email_address: email_address
+          }
+
+          body[:fields] = options[:fields] if options[:fields]
+          body[:first_name] = options[:first_name] if options[:first_name]
+
+          f.body = JSON.generate(body)
+        end
+        response.body
       end
 
       def update_subscriber(subscriber_id, options = {})
         response = connection.put("subscribers/#{subscriber_id}") do |f|
-          f.params["email_address"] = options[:email_address] if options[:email_address]
-          f.params["fields"] = options[:fields] if options[:fields]
-          f.params["first_name"] = options[:first_name] if options[:first_name]
+          body = {}
+          body[:email_address] = options[:email_address] if options[:email_address]
+          body[:fields] = options[:fields] if options[:fields]
+          body[:first_name] = options[:first_name] if options[:first_name]
+
+          f.body = JSON.generate(body)
         end
         response.body
       end
 
-      def unsubscribe(email)
-        connection.put("unsubscribe") do |f|
-          f.params['email'] = email
+      def unsubscribe(subscriber_id)
+        connection.post("unsubscribe") do |f|
+          f.body = JSON.generate({
+            id: subscriber_id
+          })
         end
       end
 
-      def remove_tag_from_subscriber(subscriber_id, tag_id)
-        connection.delete("subscribers/#{subscriber_id}/tags/#{tag_id}")
+      def subscriber_tags(subscriber_id)
+        connection.get("subscribers/#{subscriber_id}/tags")
       end
     end
   end
diff --git a/lib/convertkit_v4/client/tags.rb b/lib/convertkit_v4/client/tags.rb
index 4bb322b..c797647 100644
--- a/lib/convertkit_v4/client/tags.rb
+++ b/lib/convertkit_v4/client/tags.rb
@@ -1,50 +1,29 @@
 module ConvertkitV4
   class Client
     module Tags
+
       def tags
         connection.get("tags")
       end
 
-      def add_subscriber_to_tag(tag_id, email, options = {})
-        connection.post("tags/#{tag_id}/subscribe") do |f|
-          f.params['email'] = email
-          f.params['first_name'] = options[:first_name]
-          f.params['fields'] = options[:fields]
-          f.params['tags'] = options[:tags]
-        end
-      end
-
-      def remove_tag_from_subscriber(tag_id, subscriber_id)
-        connection.delete("subscribers/#{subscriber_id}/tags/#{tag_id}")
-      end
-
-      def remove_tag_from_subscriber_by_email(tag_id, email)
-        connection.post("tags/#{tag_id}/unsubscribe") do |f|
-          f.params['email'] = email
-        end
-      end
-
       def create_tag(tag_name)
-        response = connection.post("tags") do |request|
-          request.params["tag"] = { name: tag_name }
+        response = connection.post("tags") do |f|
+          f.body = JSON.generate({
+            name: tag_name
+          })
         end
         response.body
       end
 
-      def create_tags(tag_names)
-        response = connection.post("tags") do |request|
-          request.params["tag"] = tag_names.map { |tag_name| { name: tag_name } }
+      def add_subscriber_to_tag(tag_id, options = {})
+        connection.post("tags/#{tag_id}/subscribers") do |f|
+          f.body = JSON.generate({
+            email: options[:email],
+            id: options[:id]
+          })
         end
-        response.body
       end
 
-      def subscriptions_to_tag(tag_id, options = {})
-        connection.get("tags/#{tag_id}/subscriptions", options) do |f|
-          f.params["page"] = options[:page] if options[:page]
-          f.params["sort_order"] = options[:sort_order] if options[:sort_order]
-          f.params["subscriber_state"] = options[:subscriber_state] if options[:subscriber_state]
-        end
-      end
     end
   end
 end
diff --git a/lib/convertkit_v4/client/webhooks.rb b/lib/convertkit_v4/client/webhooks.rb
index 09a718d..4ebea41 100644
--- a/lib/convertkit_v4/client/webhooks.rb
+++ b/lib/convertkit_v4/client/webhooks.rb
@@ -1,21 +1,21 @@
 module ConvertkitV4
   class Client
     module Webhooks
+
       def webhooks
-        connection.get("automations/hooks/").body
+        connection.get("webhooks").body
       end
 
-      def create_webhook(url, events)
-        response = connection.post("automations/hooks") do |f|
-          f.params['target_url'] = url
-          f.params['event'] = events
+      def create_webhook(url, event)
+        response = connection.post("webhooks") do |f|
+          f.body = JSON.generate({
+            target_url: url,
+            event: event
+          })
         end
         response.body
       end
 
-      def remove_webhook(rule_id)
-        connection.delete("automations/hooks/#{rule_id}").body
-      end
     end
   end
 end
diff --git a/lib/convertkit_v4/version.rb b/lib/convertkit_v4/version.rb
index ce4adf1..4e29082 100644
--- a/lib/convertkit_v4/version.rb
+++ b/lib/convertkit_v4/version.rb
@@ -1,3 +1,3 @@
 module ConvertkitV4
-  VERSION = "1.0.0"
-end
\ No newline at end of file
+  VERSION = "1.0.5"
+end