init

- 框架初始化
 - 安装插件
 - 修复PHP8.4报错

addons/epay/library/v2/Yansongda/Pay/Contracts/GatewayInterface.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Yansongda\Pay\Contracts;
+
+use Symfony\Component\HttpFoundation\Response;
+use Yansongda\Supports\Collection;
+
+interface GatewayInterface
+{
+    /**
+     * Pay an order.
+     *
+     * @author yansongda <me@yansongda.cn>
+     *
+     * @param string $endpoint
+     *
+     * @return Collection|Response
+     */
+    public function pay($endpoint, ?array $payload);
+}