diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..1ad899d
Binary files /dev/null and b/.DS_Store differ
diff --git a/lib/app_store_connect/client.rb b/lib/app_store_connect/client.rb
index 5430c5d..b4d793b 100644
--- a/lib/app_store_connect/client.rb
+++ b/lib/app_store_connect/client.rb
@@ -6,7 +6,7 @@
 require 'app_store_connect/request'
 
 module AppStoreConnect
-  class Client # rubocop:disable Metrics/ClassLength
+  class Client
     def initialize(**kwargs)
       @options = options(**kwargs)
 
@@ -41,27 +41,24 @@ def web_service_endpoint_names
     end
 
     def call(web_service_endpoint, **kwargs)
+      parser = proc do |response|
+        JSON.parse(response.body)
+      end
+
       case web_service_endpoint.http_method
       when :get
-        get(web_service_endpoint, **kwargs)
+        get(web_service_endpoint, **kwargs, &parser)
       when :post
-        post(web_service_endpoint, **kwargs)
+        post(web_service_endpoint, **kwargs, &parser)
       else
         raise "invalid http method: #{web_service_endpoint.http_method}"
       end
     end
 
-    def build_url(web_service_endpoint, **kwargs)
-      web_service_endpoint
-        .url
-        .gsub(/(\{(\w+)\})/) { kwargs.fetch(Regexp.last_match(2).to_sym) }
-    end
-
-    def url_parameter_names(web_service_endpoint)
-      web_service_endpoint
+    def build_uri(web_service_endpoint, **kwargs)
+      URI(web_service_endpoint
         .url
-        .scan(/(\{(\w+)\})/)
-        .map { |_, n| n.to_sym }
+        .gsub(/(\{(\w+)\})/) { kwargs.fetch(Regexp.last_match(2).to_sym) })
     end
 
     def web_service_endpoint_by(name:)
@@ -88,49 +85,36 @@ def options(**kwargs)
       end
     end
 
-    def build_body(request)
-      request
-        .to_h
-        .deep_transform_keys { |k| k.to_s.camelize(:lower) }
-        .to_json
-    end
-
-    def build_query(web_service_endpoint, **kwargs)
-      query_parameters = kwargs.dup.tap do |hash|
-        url_parameter_names(web_service_endpoint).each do |name|
-          hash.delete(name.to_sym)
-        end
-      end
-
-      query_parameters.to_query
-    end
-
-    def get(web_service_endpoint, **kwargs)
-      url = build_url(web_service_endpoint, **kwargs)
-      query = build_query(web_service_endpoint, **kwargs)
-
+    def get(web_service_endpoint, **kwargs, &block)
       request = Request.new(
+        kwargs: kwargs,
+        web_service_endpoint: web_service_endpoint,
         http_method: :get,
-        url: url,
-        headers: headers,
-        query: query
+        uri: build_uri(web_service_endpoint, **kwargs),
+        headers: headers
       )
 
-      request.execute
+      request.execute(&block)
     end
 
-    def post(web_service_endpoint, **kwargs)
-      url = build_url(web_service_endpoint, **kwargs)
-      request = "AppStoreConnect::#{web_service_endpoint.http_body_type}".constantize.new(**kwargs)
-      body = build_body(request)
-
-      response = execute(:post, url, headers: headers, body: body)
-
-      response
+    def http_body(web_service_endpoint, **kwargs)
+      "AppStoreConnect::#{web_service_endpoint.http_body_type}"
+        .constantize
+        .new(**kwargs)
+        .to_json
     end
 
-    def execute(http_method, url, **options)
-      HTTParty.send(http_method, url, options)
+    def post(web_service_endpoint, **kwargs, &block)
+      Request.new(
+        web_service_endpoint: web_service_endpoint,
+        kwargs: kwargs,
+        http_method: :post,
+        uri: build_uri(web_service_endpoint, **kwargs),
+        headers: headers,
+        http_body: http_body(web_service_endpoint, **kwargs)
+      )
+
+      request.execute(&block)
     end
 
     def headers
diff --git a/lib/app_store_connect/request.rb b/lib/app_store_connect/request.rb
index 0e97bdd..d6dc85e 100644
--- a/lib/app_store_connect/request.rb
+++ b/lib/app_store_connect/request.rb
@@ -3,21 +3,38 @@
 require 'net/http'
 
 module AppStoreConnect
+  attr_reader :uri
+
   class Request
     def initialize(**options)
+      @uri = options.fetch(:uri)
       @options = options
     end
 
     def execute
-      response = Net::HTTP.start(uri.host, uri.port, net_http_options) do |http|
-        http.request(request)
-      end
+      Net::HTTP.start(uri.host, uri.port, net_http_options) do |http|
+        response = http.request(request)
 
-      JSON.parse(response.body)
+        yield response if block_given?
+      end
     end
 
     private
 
+    def web_service_endpoint
+      @options.fetch(:web_service_endpoint)
+    end
+
+    def query
+      return unless http_method == :get
+
+      kwargs.dup.tap do |hash|
+        url_parameter_names(web_service_endpoint).each do |name|
+          hash.delete(name.to_sym)
+        end
+      end.to_query
+    end
+
     def http_method
       @options.fetch(:http_method).to_sym
     end
@@ -26,16 +43,13 @@ def net_http_options
       { use_ssl: uri.scheme == 'https' }
     end
 
-    def query
-      return unless http_method == :get
-      return unless @options[:query]
-
-      @options[:query]
+    def kwargs
+      @options.fetch(:kwargs, {})
     end
 
     def uri
-      URI(@options.fetch(:url)).tap do |uri|
-        uri.query = query
+      @options.fetch(:uri).tap do |uri|
+        uri.query = query if http_method == :get
       end
     end
 
@@ -43,16 +57,31 @@ def headers
       @options.fetch(:headers, {})
     end
 
+    def body
+      return if http_method == :get
+
+      @options
+        .fetch(:request)
+        .to_h
+        .deep_transform_keys { |k| k.to_s.camelize(:lower) }
+        .to_json
+    end
+
+    def url_parameter_names(web_service_endpoint)
+      web_service_endpoint
+        .url
+        .scan(/(\{(\w+)\})/)
+        .map { |_, n| n.to_sym }
+    end
+
     def request
       case http_method
       when :get
-        Net::HTTP::Get.new(uri).tap do |request|
-          headers.each do |key, value|
-            request[key] = value
-          end
-        end
+        Net::HTTP::Get.new(uri, headers)
       when :post
-        Net::HTTP::Post.new(uri, headers)
+        Net::HTTP::Post.new(uri, headers).tap do |request|
+          request.body = body
+        end
       else
         raise "unsupported http method: #{http_method}"
       end