diff --git a/.env.example b/.env.example
index ef2fd86..a6ca8de 100644
--- a/.env.example
+++ b/.env.example
@@ -36,6 +36,14 @@ OAUTH2_PROXY_REDIRECT_URL=https://your-domain/oauth2/callback
 # GitHub MCP Server configuration
 GITHUB_PERSONAL_ACCESS_TOKEN=github_access_token
 
+# QuickBooks Online (QBO) Configuration
+QBO_API_URL=https://sandbox-accounts.platform.intuit.com/v1/openid_connect/userinfo
+QBO_CLIENT_ID=your_qbo_client_id
+QBO_CLIENT_SECRET=your_qbo_client_secret
+QBO_COMPANY_ID=your_qbo_company_id
+QBO_REFRESH_TOKEN=your_qbo_refresh_token
+QBO_TOKEN_ENDPOINT=https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer
+
 # =============================
 # Production Environment
 # =============================
diff --git a/workers/main/.env.test b/workers/main/.env.test
index bba98b2..ded026f 100644
--- a/workers/main/.env.test
+++ b/workers/main/.env.test
@@ -13,3 +13,10 @@ SLACK_FIN_REPORT_CHANNEL_ID=C02URP5L3U5
 
 QBO_API_URL=https://quickbooks.api.intuit.com/v3/company/111111111
 QBO_BEARER_TOKEN=test-token
+
+# QuickBooks Online (QBO) Configuration
+QBO_CLIENT_ID=your_qbo_client_id
+QBO_CLIENT_SECRET=your_qbo_client_secret
+QBO_COMPANY_ID=your_qbo_company_id
+QBO_REFRESH_TOKEN=your_qbo_refresh_token
+QBO_TOKEN_ENDPOINT=https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer
\ No newline at end of file
diff --git a/workers/main/src/configs/qbo.ts b/workers/main/src/configs/qbo.ts
index 0481ddc..c2c2cd3 100644
--- a/workers/main/src/configs/qbo.ts
+++ b/workers/main/src/configs/qbo.ts
@@ -3,9 +3,20 @@ import { z } from 'zod';
 export const qboConfig = {
   apiUrl: process.env.QBO_API_URL,
   bearerToken: process.env.QBO_BEARER_TOKEN,
+  // OAuth2 configuration
+  clientId: process.env.QBO_CLIENT_ID,
+  clientSecret: process.env.QBO_CLIENT_SECRET,
+  companyId: process.env.QBO_COMPANY_ID,
+  refreshToken: process.env.QBO_REFRESH_TOKEN,
+  tokenEndpoint:
+    process.env.QBO_TOKEN_ENDPOINT ||
+    'https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer',
 };
 
 export const qboSchema = z.object({
-  QBO_API_URL: z.string().url(),
-  QBO_BEARER_TOKEN: z.string(),
+  QBO_API_URL: z.string().url().min(1, 'QBO_API_URL is required'),
+  QBO_CLIENT_ID: z.string().min(1, 'QBO_CLIENT_ID is required'),
+  QBO_CLIENT_SECRET: z.string().min(1, 'QBO_CLIENT_SECRET is required'),
+  QBO_COMPANY_ID: z.string().min(1, 'QBO_COMPANY_ID is required'),
+  QBO_REFRESH_TOKEN: z.string().optional(),
 });