updates

Backend/requirements.txt

@@ -3,7 +3,7 @@ uvicorn[standard]==0.24.0
 python-dotenv==1.0.0
 sqlalchemy==2.0.23
 pymysql==1.1.0
-cryptography==41.0.7
+cryptography>=41.0.7
 python-jose[cryptography]==3.3.0
 bcrypt==4.1.2
 python-multipart==0.0.6
@@ -17,6 +17,9 @@ aiosmtplib==3.0.1
 jinja2==3.1.2
 alembic==1.12.1
 stripe>=13.2.0
+paypal-checkout-serversdk>=1.0.3
+pyotp==2.9.0
+qrcode[pil]==7.4.2
 
 # Enterprise features (optional but recommended)
 # redis==5.0.1  # Uncomment if using Redis caching