curl -X POST "https://api.chanl.ai/api/v1/workspaces/ws_123/scenarios/scenario_456/execute" \
  -H "Authorization: Bearer <access_token>" \
  -H "Content-Type: application/json" \
  -d '{
    "variables": {
      "charge_amount": "$49.99"
    }
  }'

{
  "success": true,
  "data": {
    "execution": {
      "id": "exec_123",
      "scenario_id": "scenario_456",
      "status": "queued",
      "simulations_created": 4,
      "estimated_completion": "2024-01-15T10:35:00Z"
    }
  }
}