Expanded API code, wrote a bunch new transformers as well.

app/Transformers/BudgetTransformer.php

@@ -0,0 +1,85 @@
+<?php
+/**
+ * BudgetTransformer.php
+ * Copyright (c) 2018 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III.
+ *
+ * Firefly III is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Firefly III is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Transformers;
+
+
+use FireflyIII\Models\Budget;
+use League\Fractal\TransformerAbstract;
+use Symfony\Component\HttpFoundation\ParameterBag;
+
+/**
+ * Class BudgetTransformer
+ */
+class BudgetTransformer extends TransformerAbstract
+{
+    /**
+     * List of resources possible to include
+     *
+     * @var array
+     */
+    protected $availableIncludes = ['user'];
+    /**
+     * List of resources to automatically include
+     *
+     * @var array
+     */
+    protected $defaultIncludes = [];
+
+    /** @var ParameterBag */
+    protected $parameters;
+
+    /**
+     * BillTransformer constructor.
+     *
+     * @param ParameterBag $parameters
+     */
+    public function __construct(ParameterBag $parameters)
+    {
+        $this->parameters = $parameters;
+    }
+
+    /**
+     * @param Budget $budget
+     *
+     * @return array
+     */
+    public function transform(Budget $budget): array
+    {
+        $data = [
+            'id'         => (int)$budget->id,
+            'updated_at' => $budget->updated_at->toAtomString(),
+            'created_at' => $budget->created_at->toAtomString(),
+            'name'       => $budget->name,
+            'links'      => [
+                [
+                    'rel' => 'self',
+                    'uri' => '/budgets/' . $budget->id,
+                ],
+            ],
+        ];
+
+        return $data;
+    }
+
+}