Add LineItem CSV import and fix Unit API

app/Support/ApiDataTransformer.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace App\Support;
 
 class ApiDataTransformer
@@ -11,7 +12,7 @@ public static function snakeToCamel(array $data): array
         $result = [];
 
         foreach ($data as $key => $value) {
-            $camelKey = self::convertSnakeToCamel($key);
+            $camelKey = lcfirst(str_replace(' ', '', ucwords(str_replace('_', ' ', $key))));
 
             if (is_array($value)) {
                 $result[$camelKey] = self::snakeToCamel($value);
@@ -33,7 +34,7 @@ public static function camelToSnake(array $data): array
         $result = [];
 
         foreach ($data as $key => $value) {
-            $snakeKey = self::convertCamelToSnake($key);
+            $snakeKey = strtolower(preg_replace('/(?<!^)[A-Z]/', '_$0', $key));
 
             if (is_array($value)) {
                 $result[$snakeKey] = self::camelToSnake($value);
@@ -47,19 +48,23 @@ public static function camelToSnake(array $data): array
         return $result;
     }
 
-    /**
-     * Convert a single string from snake_case to camelCase
-     */
-    protected static function convertSnakeToCamel(string $string): string
-    {
-        return lcfirst(str_replace(' ', '', ucwords(str_replace('_', ' ', $string))));
-    }
 
-    /**
-     * Convert a single string from camelCase to snake_case
-     */
-    protected static function convertCamelToSnake(string $string): string
+    protected function parseGermanNumber($value)
     {
-        return strtolower(preg_replace('/(?<!^)[A-Z]/', '_$0', $string));
+        if (is_numeric($value)) {
+            return (float)$value;
+        }
+
+        if (!is_string($value)) {
+            return 0.0;
+        }
+
+        // Remove all dots (thousands separators)
+        $value = str_replace('.', '', $value);
+
+        // Replace comma with dot for decimal separator
+        $value = str_replace(',', '.', $value);
+
+        return (float)$value;
     }
-}
+}