增加运行时缓存路径配置

WePayV3/Contracts/BasicWePay.php

@@ -103,6 +103,10 @@ abstract class BasicWePay
             throw new InvalidArgumentException('Failed to parse certificate public key');
         }
 
+        if (!empty($options['cache_path'])) {
+            Tools::$cache_path = $options['cache_path'];
+        }
+
         // 服务商参数支持
 //        if (!empty($options['sp_appid'])) {
 //            $this->config['sp_appid'] = $options['sp_appid'];

_test/pay-v3-config.php

@@ -39,4 +39,6 @@ return [
     'cert_public'  => $certPublic,
     // 必填，微信商户证书私钥，支持证书内容或文件路径
     'cert_private' => $certPrivate,
+    // 可选，运行时的文件缓存路径
+    'cache_path'   => ''
 ];