diff --git a/CHANGELOG.md b/CHANGELOG.md
index b5ae280..d03c9db 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -139,4 +139,14 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
 - deploy cli config.json placed next to tenant.yml will be merged into deploy configuration.
 
 ### Changed
-- reverted to auth0 v2.42.0
\ No newline at end of file
+- reverted to auth0 v2.42.0
+
+## [1.4.2] - 2023-04-19
+### Added
+- Support for Codespaces added so that when the registered command `openEndpointByName` is used, it resolves the correct URL for apps launched in the Codespaces environment.
+
+## [1.4.3] - 2023-05-01
+### Added
+- Implemented `auth0.lab.postConfigureCommand` command
+- Support for writing more than one app config to a single `.env` without overwriting values
+- Added runtime-specific replacement values for tenant configuration from yaml: `CODESPACE_NAME` (same as defined [here]( https://docs.github.com/en/codespaces/developing-in-codespaces/default-environment-variables-for-your-codespace)) and `AUTH0_DOMAIN` (your tenant domain). 
diff --git a/README.md b/README.md
index 2e1f2d4..49b166d 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,9 @@ In addition to the visual features listed below, the Labs extension also contrib
 - **Auth0: Configure Tenant Resources** - `auth0.lab.tenantConfigure` Configures tenant for the current lab materials. Only available when lab materials are present in workspace.
 - **Auth0: Export Tenant** - `auth0.exportTenant` Exports tenant configuration yml to the root directory. This exports everything and needs to be edited down for a lab. 
 - **Auth0: Open Endpoint Url** - `auth0.lab.openEndpointByName?["Endpoint 1, Endpoint 2"]` Opens the URL associated with a specific named endpoint in the default browser. Multiple endpoints can be opened by supplying a comma seperated list. Only available when lab materials are present in workspace.
+- **Auth0: Run Post Configure Command** `auth0.lab.postConfigureCommand` Allows you to specify the path of a shell script in `environment.json` (i.e., `"postConfigureCommand": "<script-path>"`), that will execute upon configuration completion. Enables you to run a script to perform actions like storing values client id and client secret as secrets in the environment. This command currently has access to the following environment variables:
+  - `AUTH0_DOMAIN`: Your Auth0 domain URI
+  - `AUTH0_TOKEN`: The access token issued to your client from the authorization server.
 
 ### Authenticating
 
diff --git a/package.json b/package.json
index 1f7410e..a6c36a4 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "vscode-labs",
   "preview": true,
   "displayName": "Auth0 Labs",
-  "version": "1.4.2",
+  "version": "1.4.3",
   "description": "A Visual Studio Code extension for training lab automation and quick access to tenant information.",
   "main": "./dist/extension.js",
   "publisher": "auth0",
@@ -224,6 +224,13 @@
         "icon": "$(beaker)",
         "enablement": "auth0:authenticated && auth0:isLabWorkspace"
       },
+      {
+        "category": "Auth0",
+        "command": "auth0.lab.postConfigureCommand",
+        "title": "Run Post Configure Command",
+        "icon": "$(beaker)",
+        "enablement": "auth0:authenticated && auth0:isLabWorkspace"
+      },
       {
         "category": "Auth0",
         "command": "auth0.lab.openLocalEndpoint",
diff --git a/src/features/deploy/commands.ts b/src/features/deploy/commands.ts
index ed68bdc..17b002d 100644
--- a/src/features/deploy/commands.ts
+++ b/src/features/deploy/commands.ts
@@ -71,6 +71,10 @@ export class DeployCommands {
           AUTH0_DOMAIN: getDomainFromToken(accessToken),
           AUTH0_CLIENT_ID: 'NEEDED FOR v7.17.0 Deploy CLI',
           AUTH0_ALLOW_DELETE: false,
+          AUTH0_KEYWORD_REPLACE_MAPPINGS: {
+            AUTH0_DOMAIN: getDomainFromToken(accessToken),
+            CODESPACE_NAME: process.env.CODESPACE_NAME
+          }
         }),
       };
       await deploy(opts);
diff --git a/src/features/labs/commands.ts b/src/features/labs/commands.ts
index 5fe33d1..7170259 100644
--- a/src/features/labs/commands.ts
+++ b/src/features/labs/commands.ts
@@ -3,7 +3,13 @@ import * as path from 'path';
 import { getLabEnvironment, getLabWorkspace } from './workspace';
 import { LabResourceResolverBuilder } from './resolver';
 import { LabEnvWriter } from './writer';
-import { getUrlForPort, getFileUri, startTour } from '../../utils';
+import { getClient } from '../../client';
+import {
+  getDomainFromToken,
+  getUrlForPort,
+  getFileUri,
+  startTour,
+} from '../../utils';
 
 const registerCommand = commands.registerCommand;
 const executeCommand = commands.executeCommand;
@@ -25,6 +31,10 @@ export class LabCommands {
         registerCommand('auth0.lab.configure', this.configureLab),
         registerCommand('auth0.lab.localConfigure', this.localConfigure),
         registerCommand('auth0.lab.tenantConfigure', this.tenantConfigure),
+        registerCommand(
+          'auth0.lab.postConfigureCommand',
+          this.postConfigureCommand
+        ),
         registerCommand('auth0.lab.openLocalEndpoint', this.openLocalEndpoint),
         registerCommand(
           'auth0.lab.openEndpointByName',
@@ -144,11 +154,20 @@ export class LabCommands {
             await executeCommand('auth0.lab.localConfigure');
           }
 
+          if (labEnv.postConfigureCommand && !token.isCancellationRequested) {
+            progress.report({
+              message: 'running post configure command',
+              increment: 4,
+            });
+
+            await executeCommand('auth0.lab.postConfigureCommand');
+          }
+
           //issue post command to kick off next process
           if (labEnv.postConfigureTour && !token.isCancellationRequested) {
             progress.report({
               message: 'Starting Lab',
-              increment: 4,
+              increment: 5,
             });
 
             const uri = getFileUri(
@@ -190,4 +209,31 @@ export class LabCommands {
       new LabEnvWriter(workspace.uri).writeAll(resolvers);
     }
   };
+
+  postConfigureCommand = async (): Promise<void> => {
+    console.log('auth0.labs.postConfigure');
+    const workspace = getLabWorkspace();
+    const labEnv = await getLabEnvironment();
+    const client = await getClient();
+    const accessToken = await client.getAccessToken();
+
+    if (workspace && labEnv && labEnv.postConfigureCommand) {
+      const uri = getFileUri(
+        `/.auth0/lab/${labEnv.postConfigureCommand}`,
+        workspace.uri
+      );
+
+      const terminal = window.createTerminal({
+        name: 'Post Configure Script',
+        env: {
+          // eslint-disable-next-line @typescript-eslint/naming-convention
+          AUTH0_DOMAIN: getDomainFromToken(accessToken),
+          // eslint-disable-next-line @typescript-eslint/naming-convention
+          AUTH0_TOKEN: accessToken,
+        },
+      });
+      terminal.show();
+      terminal.sendText(uri.fsPath);
+    }
+  };
 }
diff --git a/src/features/labs/models.ts b/src/features/labs/models.ts
index af56b4a..b42c86f 100644
--- a/src/features/labs/models.ts
+++ b/src/features/labs/models.ts
@@ -4,6 +4,7 @@ export interface LocalEnvironment {
   resources: string | null;
   unauthenticatedTour: string | null;
   postConfigureTour: string | null;
+  postConfigureCommand: string | null;
   clients: Array<Resource>;
   resourceServers: Array<Resource>;
 }
diff --git a/src/features/labs/writer.ts b/src/features/labs/writer.ts
index ad23a71..27a1fe6 100644
--- a/src/features/labs/writer.ts
+++ b/src/features/labs/writer.ts
@@ -1,24 +1,50 @@
 import * as vscode from 'vscode';
+import { readUriContents } from '../../utils';
 import { Resolver } from './resolver';
 
 const openTextDocument = vscode.workspace.openTextDocument;
 const fs = vscode.workspace.fs;
 
 export class LabEnvWriter {
-  constructor(private worspace: vscode.Uri) {}
+  constructor(private workspace: vscode.Uri) {}
+
+  getExisting = async (uri: vscode.Uri) => {
+    try {
+      // will error if file does not exist
+      const stat = await fs.stat(uri);
+
+      // read and parse file into name/value pairs
+      return await readUriContents(uri)
+        .then((file) => file.split('\n'))
+        .then((lines) =>
+          lines.map((line) => {
+            const pair = line.split('=');
+            return { name: pair[0], value: pair[1] };
+          })
+        );
+    } catch {
+      // return an empty array if file does not exist
+      return [];
+    }
+  };
 
   writeAll = async (resolvers: Resolver[]) => {
-    resolvers.forEach(async (resolver) => {
+    for (const resolver of resolvers) {
       const uri = vscode.Uri.joinPath(
-        this.worspace,
+        this.workspace,
         resolver.getDirectory(),
         '.env'
       );
-      const env = resolver
-        .resolveEnv(resolvers)
-        .map((i) => `${i.name}=${i.value}`)
-        .join('\n');
+
+      const existingEnv = await this.getExisting(uri);
+      const newEnv = resolver.resolveEnv(resolvers);
+      const unique = [
+        ...new Map(existingEnv.concat(newEnv).map((m) => [m.name, m])).values(),
+      ];
+
+      const env = unique.map((i) => `${i.name}=${i.value}`).join('\n');
+
       await fs.writeFile(uri, Buffer.from(env, 'utf8'));
-    });
+    }
   };
 }
diff --git a/tests/suite/extension.test.ts b/tests/suite/extension.test.ts
index 2bdaaca..145695e 100644
--- a/tests/suite/extension.test.ts
+++ b/tests/suite/extension.test.ts
@@ -15,5 +15,5 @@ suite('Extension', () => {
       await started.activate();
       assert.strictEqual(started && started.isActive, true);
     }
-  });
+  }).timeout(1000 * 10);//10 seconds
 });