add account balances with some random data

app/JsonApi/V3/AccountBalances/AccountBalanceSchema.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace FireflyIII\JsonApi\V3\AccountBalances;
+
+use FireflyIII\Entities\AccountBalance;
+use LaravelJsonApi\Core\Schema\Schema;
+use LaravelJsonApi\Eloquent\Fields\Relations\HasOne;
+use LaravelJsonApi\NonEloquent\Fields\Attribute;
+use LaravelJsonApi\NonEloquent\Fields\ID;
+
+class AccountBalanceSchema extends Schema
+{
+
+    /**
+     * The model the schema corresponds to.
+     *
+     * @var string
+     */
+    public static string $model = AccountBalance::class;
+
+    /**
+     * Get the resource fields.
+     *
+     * @return array
+     */
+    public function fields(): array
+    {
+        return [
+            ID::make(),
+            Attribute::make('name'),
+            Attribute::make('amount'),
+            HasOne::make('account'),
+        ];
+    }
+
+    /**
+     * Get the resource filters.
+     *
+     * @return array
+     */
+    public function filters(): array
+    {
+        return [
+            // Filter::make('id'),
+        ];
+    }
+
+    public function repository(): AccountBalanceRepository
+    {
+        return AccountBalanceRepository::make()
+                                       ->withServer($this->server)
+                                       ->withSchema($this);
+    }
+}