Validate SAC
============

This section explains how to validate SAC (Services Accounting Code) codes.

What is SAC Validation?
-----------------------

SAC validation ensures that the provided SAC code:
- Exists in the official GST database
- Is properly formatted (6 digits)
- Is currently active and applicable for services

Validation Process
-----------------

1. **Input Validation**
   - Check if SAC code is numeric
   - Verify length (6 digits)
   - Validate format pattern

2. **Database Lookup**
   - Search in official GST SAC database
   - Check if code is active
   - Verify service description matches

3. **Response Generation**
   - Return validation status
   - Provide error details if invalid
   - Include SAC information if valid

API Endpoint
-----------

.. code-block:: bash

   POST /api/v1/validate/sac
   
   {
     "sac_code": "123456"
   }

Response Format
--------------

.. code-block:: json

   {
     "status": "success",
     "valid": true,
     "sac_code": "123456",
     "description": "Valid SAC code",
     "gst_rate": "18%"
   }

Error Response
-------------

.. code-block:: json

   {
     "status": "error",
     "valid": false,
     "error": "Invalid SAC code format",
     "message": "SAC code must be 6 digits"
   }