"use_config_qty_increments":"0"
   "qty_increments":"15.0000"
   "use_config_enable_qty_inc":"0"
   "enable_qty_increments":"1"

if (isset($data['qty_increments'])) {
        $stockData['qty_increments'] = $data['qty_increments'];
    }

    if (isset($data['use_config_qty_increments'])) {
        $stockData['use_config_qty_increments'] = $data['use_config_qty_increments'];
    }

    if (isset($data['enable_qty_increments'])) {
        $stockData['enable_qty_increments'] = $data['enable_qty_increments'];
    }

    if (isset($data['use_config_enable_qty_inc'])) {
        $stockData['use_config_enable_qty_inc'] = $data['use_config_enable_qty_inc'];
    }