APIs and views for exchange rates.

app/Repositories/UserGroups/ExchangeRate/ExchangeRateRepositoryInterface.php

@@ -0,0 +1,34 @@
+<?php
+/*
+ * ExchangeRateRepositoryInterface.php
+ * Copyright (c) 2024 james@firefly-iii.org.
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see https://www.gnu.org/licenses/.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Repositories\UserGroups\ExchangeRate;
+
+use FireflyIII\Models\TransactionCurrency;
+use Illuminate\Support\Collection;
+
+interface ExchangeRateRepositoryInterface
+{
+
+    public function getRates(TransactionCurrency $from, TransactionCurrency $to): Collection;
+
+}