1、增加如下配置sql:

可以直接在數據庫工具執行

INSERT INTO `eb_system_config` (`id`, `is_store`, `menu_name`, `type`, `input_type`, `config_tab_id`, `parameter`, `upload_type`, `required`, `width`, `high`, `value`, `info`, `desc`, `sort`, `status`) VALUES
(null, 0, 'v3_pay_public_key', 'text', 'input', 4, '', 1, '', 100, 0, '\"\"', 'v3支付公鑰', 'v3支付公鑰，新版本使用公鑰請填寫', 0, 1),
(null, 0, 'v3_pay_public_pem', 'upload', 'input', 4, '', 3, '', 0, 0, '\"\"', 'v3支付公鑰證書', 'v3支付公鑰證書，使用新版本支付公鑰上傳此證書', 0, 1);

2、文件：config/wechat.php

增加如下代碼

3、文件：app/services/system/config/SystemConfigServices.php

找方法：shopPayFormBuild，增加如下代碼：

下部分代碼可以復制：

Build::input('v3_pay_public_key', $data['v3_pay_public_key']['info'], $data['v3_pay_public_key']['value'])->info($data['v3_pay_public_key']['desc']),
Build::uploadImage('v3_pay_public_pem', $data['v3_pay_public_pem']['info'], $data['v3_pay_public_pem']['value'])
							->url('/file/upload/1?type=1')->format(config('upload.fileExt'))->headers(['Authori-zation' => app()->request->header('Authori-zation')])
							->type('file')->icon('md-add')->info($data['v3_pay_public_pem']['desc']),

4、文件：crmeb/services/wechat/config/V3PaymentConfig.php

增加下面三張圖，截圖中部分代碼

下圖代碼，可以在這里復制：

$this->v3_pay_public_key = $this->v3_pay_public_key ?: $this->httpConfig->getConfig('v3_pay.public_key', '');
$this->v3_pay_public_pem = $this->v3_pay_public_key ?: $this->httpConfig->getConfig('v3_pay.public_pem', '');

5、文件：crmeb/services/wechat/v3pay/BaseClient.php

修改如下圖所示：可以復制代碼：

if ($this->app['config']['v3_payment']['v3_pay_public_key'] != '') {
				$options['headers']['Wechatpay-Serial'] = $this->app['config']['v3_payment']['v3_pay_public_key'];
			} else {
				$options['headers']['Wechatpay-Serial'] = $this->getCertficatescAttr('serial_no');
			}

繼續在這個文件，找getPublicKey方法：

可以在這里復制

if ($this->app['config']['v3_payment']['v3_pay_public_key'] != '') {
			$key_path = $this->app['config']['v3_payment']['v3_pay_public_pem'];
		} else {
			$key_path = $this->app['config']['v3_payment']['cert_path'];
		}