diff --git a/README.md b/README.md
index 78a674a..c0dfa63 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,42 @@ upload_to_browserstack_app_live(
 ```
 Check out the example [Fastfile](https://github.com/browserstack/browserstack-fastlane-plugin/blob/master/fastlane/Fastfile) to see how to use this plugin. Try it by including that in your project's Fastfile, running `fastlane install_plugins` and `bundle exec fastlane test`. Please refer to this [sample android project](https://github.com/browserstack/browserstack-android-sample-app), which demonstrates the use of this plugin.
 
-Once the app upload is successful, the app id of the app will be stored in an environment variable, "BROWSERSTACK_APP_ID" and it can be accessed in your tests in the following way :
+### Environment variable fallbacks (dotenv friendly)
+
+All action parameters support environment variable fallback.
+
+For `upload_to_browserstack_app_automate`:
+
+- `browserstack_username` -> `BROWSERSTACK_USERNAME`
+- `browserstack_access_key` -> `BROWSERSTACK_ACCESS_KEY`
+- `file_path` -> `BROWSERSTACK_FILE_PATH`
+- `custom_id` -> `BROWSERSTACK_CUSTOM_ID`
+- `ios_keychain_support` -> `BROWSERSTACK_IOS_KEYCHAIN_SUPPORT`
+
+For `upload_to_browserstack_app_live`:
+
+- `browserstack_username` -> `BROWSERSTACK_USERNAME`
+- `browserstack_access_key` -> `BROWSERSTACK_ACCESS_KEY`
+- `file_path` -> `BROWSERSTACK_FILE_PATH`
+
+### Upload outputs
+
+For `upload_to_browserstack_app_automate`:
+
+- `BROWSERSTACK_APP_ID` always contains `app_url` from BrowserStack upload response.
+- `BROWSERSTACK_CUSTOM_ID` contains `custom_id` from BrowserStack upload response.
+- If `custom_id` is absent in response, `BROWSERSTACK_CUSTOM_ID` is set to empty string (`""`).
+
+The same values are also exposed in lane context:
+
+- `SharedValues::BROWSERSTACK_APP_ID`
+- `SharedValues::BROWSERSTACK_CUSTOM_ID`
+
+For `upload_to_browserstack_app_live`:
+
+- `BROWSERSTACK_LIVE_APP_ID` contains `app_url` from BrowserStack upload response.
+
+Once the app upload is successful, the app URL of the app will be stored in an environment variable, "BROWSERSTACK_APP_ID" and it can be accessed in your tests in the following way :
 ```
 String app = System.getenv("BROWSERSTACK_APP_ID"); // Get app id from environment variable.
 capabilities.setCapability("app", app); // Add app id to driver capability.
@@ -82,4 +117,3 @@ For more information about how the `fastlane` plugin system works, check out the
 ## About _fastlane_
 
 _fastlane_ is the easiest way to automate beta deployments and releases for your iOS and Android apps. To learn more, check out [fastlane.tools](https://fastlane.tools).
-
diff --git a/lib/fastlane/plugin/browserstack/actions/upload_to_browserstack_app_automate_action.rb b/lib/fastlane/plugin/browserstack/actions/upload_to_browserstack_app_automate_action.rb
index 86f9714..e760e0a 100644
--- a/lib/fastlane/plugin/browserstack/actions/upload_to_browserstack_app_automate_action.rb
+++ b/lib/fastlane/plugin/browserstack/actions/upload_to_browserstack_app_automate_action.rb
@@ -6,6 +6,7 @@ module Fastlane
   module Actions
     module SharedValues
       BROWSERSTACK_APP_ID ||= :BROWSERSTACK_APP_ID
+      BROWSERSTACK_CUSTOM_ID ||= :BROWSERSTACK_CUSTOM_ID
     end
     class UploadToBrowserstackAppAutomateAction < Action
       SUPPORTED_FILE_EXTENSIONS = ["apk", "ipa", "aab"]
@@ -23,17 +24,22 @@ def self.run(params)
 
         UI.message("Uploading app to BrowserStack AppAutomate...")
 
-        browserstack_app_id = Helper::BrowserstackHelper.upload_file(browserstack_username, browserstack_access_key, file_path, UPLOAD_API_ENDPOINT, custom_id, ios_keychain_support)
+        upload_response = Helper::BrowserstackHelper.upload_file(browserstack_username, browserstack_access_key, file_path, UPLOAD_API_ENDPOINT, custom_id, ios_keychain_support)
+        browserstack_app_id = upload_response["app_url"]
+        browserstack_custom_id = upload_response["custom_id"] || ""
 
         # Set 'BROWSERSTACK_APP_ID' environment variable, if app upload was successful.
         ENV['BROWSERSTACK_APP_ID'] = browserstack_app_id
+        ENV['BROWSERSTACK_CUSTOM_ID'] = browserstack_custom_id
 
         UI.success("Successfully uploaded app " + file_path + " to BrowserStack AppAutomate with app_url : " + browserstack_app_id)
 
         UI.success("Setting Environment variable BROWSERSTACK_APP_ID = " + browserstack_app_id)
+        UI.success("Setting Environment variable BROWSERSTACK_CUSTOM_ID = " + browserstack_custom_id)
 
         # Setting app id in SharedValues, which can be used by other fastlane actions.
         Actions.lane_context[SharedValues::BROWSERSTACK_APP_ID] = browserstack_app_id
+        Actions.lane_context[SharedValues::BROWSERSTACK_CUSTOM_ID] = browserstack_custom_id
       end
 
       # Validate file_path.
@@ -74,7 +80,8 @@ def self.details
 
       def self.output
         [
-          ['BROWSERSTACK_APP_ID', 'App id of uploaded app.']
+          ['BROWSERSTACK_APP_ID', 'App URL of uploaded app.'],
+          ['BROWSERSTACK_CUSTOM_ID', 'Custom id of uploaded app. Empty string when custom_id is not set.']
         ]
       end
 
@@ -100,6 +107,7 @@ def self.available_options
         [
           FastlaneCore::ConfigItem.new(key: :browserstack_username,
                                        description: "BrowserStack's username",
+                                       env_name: "BROWSERSTACK_USERNAME",
                                        optional: false,
                                        is_string: true,
                                        verify_block: proc do |value|
@@ -107,6 +115,7 @@ def self.available_options
                                        end),
           FastlaneCore::ConfigItem.new(key: :browserstack_access_key,
                                        description: "BrowserStack's access key",
+                                       env_name: "BROWSERSTACK_ACCESS_KEY",
                                        optional: false,
                                        is_string: true,
                                        verify_block: proc do |value|
@@ -114,15 +123,18 @@ def self.available_options
                                        end),
           FastlaneCore::ConfigItem.new(key: :custom_id,
                                        description: "Custom id",
+                                       env_name: "BROWSERSTACK_CUSTOM_ID",
                                        optional: true,
                                        is_string: true),
           FastlaneCore::ConfigItem.new(key: :file_path,
                                        description: "Path to the app file",
+                                       env_name: "BROWSERSTACK_FILE_PATH",
                                        optional: true,
                                        is_string: true,
                                        default_value: default_file_path),
           FastlaneCore::ConfigItem.new(key: :ios_keychain_support,
                                        description: "Enable/disable support for iOS keychain",
+                                       env_name: "BROWSERSTACK_IOS_KEYCHAIN_SUPPORT",
                                        optional: true,
                                        is_string: true)
         ]
diff --git a/lib/fastlane/plugin/browserstack/actions/upload_to_browserstack_app_live_action.rb b/lib/fastlane/plugin/browserstack/actions/upload_to_browserstack_app_live_action.rb
index 30ea8ce..adb02cc 100644
--- a/lib/fastlane/plugin/browserstack/actions/upload_to_browserstack_app_live_action.rb
+++ b/lib/fastlane/plugin/browserstack/actions/upload_to_browserstack_app_live_action.rb
@@ -20,7 +20,8 @@ def self.run(params)
 
         UI.message("Uploading app to BrowserStack AppLive...")
 
-        browserstack_app_id = Helper::BrowserstackHelper.upload_file(browserstack_username, browserstack_access_key, file_path, UPLOAD_API_ENDPOINT)
+        upload_response = Helper::BrowserstackHelper.upload_file(browserstack_username, browserstack_access_key, file_path, UPLOAD_API_ENDPOINT)
+        browserstack_app_id = upload_response["app_url"]
 
         # Set 'BROWSERSTACK_APP_ID' environment variable, if app upload was successful.
         ENV['BROWSERSTACK_LIVE_APP_ID'] = browserstack_app_id
@@ -58,7 +59,7 @@ def self.details
 
       def self.output
         [
-          ['BROWSERSTACK_LIVE_APP_ID', 'App id of uploaded app.']
+          ['BROWSERSTACK_LIVE_APP_ID', 'App URL of uploaded app.']
         ]
       end
 
@@ -84,6 +85,7 @@ def self.available_options
         [
           FastlaneCore::ConfigItem.new(key: :browserstack_username,
                                        description: "BrowserStack's username",
+                                       env_name: "BROWSERSTACK_USERNAME",
                                        optional: false,
                                        is_string: true,
                                        verify_block: proc do |value|
@@ -91,6 +93,7 @@ def self.available_options
                                        end),
           FastlaneCore::ConfigItem.new(key: :browserstack_access_key,
                                        description: "BrowserStack's access key",
+                                       env_name: "BROWSERSTACK_ACCESS_KEY",
                                        optional: false,
                                        is_string: true,
                                        verify_block: proc do |value|
@@ -98,6 +101,7 @@ def self.available_options
                                        end),
           FastlaneCore::ConfigItem.new(key: :file_path,
                                        description: "Path to the app file",
+                                       env_name: "BROWSERSTACK_FILE_PATH",
                                        optional: true,
                                        is_string: true,
                                        default_value: default_file_path)
diff --git a/lib/fastlane/plugin/browserstack/helper/browserstack_helper.rb b/lib/fastlane/plugin/browserstack/helper/browserstack_helper.rb
index ff76706..850e935 100644
--- a/lib/fastlane/plugin/browserstack/helper/browserstack_helper.rb
+++ b/lib/fastlane/plugin/browserstack/helper/browserstack_helper.rb
@@ -20,6 +20,7 @@ def self.show_message
       # +custom_id+:: Custom id for app upload.
       # +file_path+:: Path to the file to be uploaded.
       # +url+:: BrowserStack's app upload endpoint.
+      # Returns:: Hash response from BrowserStack upload API.
       def self.upload_file(browserstack_username, browserstack_access_key, file_path, url, custom_id = nil, ios_keychain_support = nil)
         payload = {
           multipart: true,
@@ -47,13 +48,7 @@ def self.upload_file(browserstack_username, browserstack_access_key, file_path,
             headers: headers
           )
 
-          response_json = JSON.parse(response.to_s)
-
-          if !response_json["custom_id"].nil?
-            return response_json["custom_id"]
-          else
-            return response_json["app_url"]
-          end
+          JSON.parse(response.to_s)
         rescue RestClient::ExceptionWithResponse => err
           begin
             error_response = JSON.parse(err.response.to_s)["error"]
diff --git a/spec/upload_to_browserstack_app_automate_action_spec.rb b/spec/upload_to_browserstack_app_automate_action_spec.rb
index c46a562..f04d099 100644
--- a/spec/upload_to_browserstack_app_automate_action_spec.rb
+++ b/spec/upload_to_browserstack_app_automate_action_spec.rb
@@ -3,8 +3,16 @@
     let(:custom_id) { "customId" }
 
     before(:each) do
+      ENV['BROWSERSTACK_USERNAME'] = nil
+      ENV['BROWSERSTACK_ACCESS_KEY'] = nil
+      ENV['BROWSERSTACK_FILE_PATH'] = nil
+      ENV['BROWSERSTACK_CUSTOM_ID'] = nil
+      ENV['BROWSERSTACK_IOS_KEYCHAIN_SUPPORT'] = nil
+      ENV['BROWSERSTACK_APP_ID'] = nil
       Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::GRADLE_APK_OUTPUT_PATH] = nil
       Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::GRADLE_AAB_OUTPUT_PATH] = nil
+      Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::BROWSERSTACK_APP_ID] = nil
+      Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::BROWSERSTACK_CUSTOM_ID] = nil
     end
 
     it "raises an error if no browserstack_username is given" do
@@ -102,9 +110,12 @@
           upload_to_browserstack_app_automate({
             browserstack_username: 'browserstack_username',
             browserstack_access_key: 'browserstack_access_key',
-          })
+           })
         end").runner.execute(:test)
       expect(ENV['BROWSERSTACK_APP_ID']).to eq("bs://app_url")
+      expect(ENV['BROWSERSTACK_CUSTOM_ID']).to eq("")
+      expect(Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::BROWSERSTACK_APP_ID]).to eq("bs://app_url")
+      expect(Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::BROWSERSTACK_CUSTOM_ID]).to eq("")
     end
 
     it "should work with correct params defaulting with aab on android" do
@@ -120,7 +131,6 @@
     end
 
     it "should work with correct params and specific file_path" do
-      ENV['BROWSERSTACK_APP_ID'] = nil
       expect(RestClient::Request).to receive(:execute).and_return({ "app_url" => "bs://app_url" }.to_json)
       Fastlane::FastFile.new.parse("lane :test do
           upload_to_browserstack_app_automate({
@@ -131,24 +141,27 @@
         end").runner.execute(:test)
 
       expect(ENV['BROWSERSTACK_APP_ID']).to eq("bs://app_url")
+      expect(ENV['BROWSERSTACK_CUSTOM_ID']).to eq("")
+      expect(Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::BROWSERSTACK_CUSTOM_ID]).to eq("")
     end
 
     it "should work with custom id" do
-      ENV['BROWSERSTACK_APP_ID'] = nil
       expect(RestClient::Request).to receive(:execute).and_return({ "app_url" => "bs://app_url", "custom_id" => custom_id, "shareable_id" => "username/#{custom_id}" }.to_json)
       Fastlane::FastFile.new.parse("lane :test do
           upload_to_browserstack_app_automate({
             browserstack_username: 'username',
             browserstack_access_key: 'access_key',
             custom_id: '#{custom_id}',
-            file_path: File.join(FIXTURE_PATH, 'HelloWorld.apk')
-          })
+             file_path: File.join(FIXTURE_PATH, 'HelloWorld.apk')
+           })
         end").runner.execute(:test)
-      expect(ENV['BROWSERSTACK_APP_ID']).to eq(custom_id)
+      expect(ENV['BROWSERSTACK_APP_ID']).to eq("bs://app_url")
+      expect(ENV['BROWSERSTACK_CUSTOM_ID']).to eq(custom_id)
+      expect(Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::BROWSERSTACK_APP_ID]).to eq("bs://app_url")
+      expect(Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::BROWSERSTACK_CUSTOM_ID]).to eq(custom_id)
     end
 
     it "should work with ios keychain support" do
-      ENV['BROWSERSTACK_APP_ID'] = nil
       Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::IPA_OUTPUT_PATH] = nil
       expect(RestClient::Request).to receive(:execute).and_return({ "app_url" => "bs://app_url", "ios_keychain_support" => true }.to_json)
       fastfile = Fastlane::FastFile.new.parse("
@@ -165,6 +178,31 @@
       ")
       fastfile.runner.execute(:test, :ios)
       expect(ENV['BROWSERSTACK_APP_ID']).to eq("bs://app_url")
+      expect(ENV['BROWSERSTACK_CUSTOM_ID']).to eq("")
+    end
+
+    it "should use env var fallback for automate params" do
+      ENV['BROWSERSTACK_USERNAME'] = 'username'
+      ENV['BROWSERSTACK_ACCESS_KEY'] = 'access_key'
+      ENV['BROWSERSTACK_FILE_PATH'] = File.join(FIXTURE_PATH, 'HelloWorld.apk')
+      ENV['BROWSERSTACK_CUSTOM_ID'] = 'env_custom_id'
+      ENV['BROWSERSTACK_IOS_KEYCHAIN_SUPPORT'] = 'false'
+
+      expect(RestClient::Request).to receive(:execute).with(
+        hash_including(
+          payload: hash_including(
+            data: '{ "custom_id": "env_custom_id" }',
+            ios_keychain_support: 'false'
+          )
+        )
+      ).and_return({ "app_url" => "bs://app_url", "custom_id" => "response_custom_id" }.to_json)
+
+      Fastlane::FastFile.new.parse("lane :test do
+          upload_to_browserstack_app_automate({})
+        end").runner.execute(:test)
+
+      expect(ENV['BROWSERSTACK_APP_ID']).to eq("bs://app_url")
+      expect(ENV['BROWSERSTACK_CUSTOM_ID']).to eq("response_custom_id")
     end
   end
 end
diff --git a/spec/upload_to_browserstack_app_live_action_spec.rb b/spec/upload_to_browserstack_app_live_action_spec.rb
index a425fbb..fa24ae3 100644
--- a/spec/upload_to_browserstack_app_live_action_spec.rb
+++ b/spec/upload_to_browserstack_app_live_action_spec.rb
@@ -1,6 +1,10 @@
 describe Fastlane::Actions::UploadToBrowserstackAppLiveAction do
   describe 'Upload to BrowserStack AppLive' do
     before(:each) do
+      ENV['BROWSERSTACK_USERNAME'] = nil
+      ENV['BROWSERSTACK_ACCESS_KEY'] = nil
+      ENV['BROWSERSTACK_FILE_PATH'] = nil
+      ENV['BROWSERSTACK_LIVE_APP_ID'] = nil
       Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::GRADLE_APK_OUTPUT_PATH] = nil
       Fastlane::Actions.lane_context[Fastlane::Actions::SharedValues::GRADLE_AAB_OUTPUT_PATH] = nil
     end
@@ -118,7 +122,6 @@
     end
 
     it "should work with correct params and specific file_path" do
-      ENV['BROWSERSTACK_LIVE_APP_ID'] = nil
       expect(RestClient::Request).to receive(:execute).and_return({ "app_url" => "bs://app_url" }.to_json)
       Fastlane::FastFile.new.parse("lane :test do
           upload_to_browserstack_app_live({
@@ -129,5 +132,18 @@
         end").runner.execute(:test)
       expect(ENV['BROWSERSTACK_LIVE_APP_ID']).to eq("bs://app_url")
     end
+
+    it "should use env var fallback for live params" do
+      ENV['BROWSERSTACK_USERNAME'] = 'username'
+      ENV['BROWSERSTACK_ACCESS_KEY'] = 'access_key'
+      ENV['BROWSERSTACK_FILE_PATH'] = File.join(FIXTURE_PATH, 'HelloWorld.apk')
+
+      expect(RestClient::Request).to receive(:execute).and_return({ "app_url" => "bs://app_url" }.to_json)
+      Fastlane::FastFile.new.parse("lane :test do
+          upload_to_browserstack_app_live({})
+        end").runner.execute(:test)
+
+      expect(ENV['BROWSERSTACK_LIVE_APP_ID']).to eq("bs://app_url")
+    end
   end
 end