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The steps of toping up a Sandbox buyer account are as follows:

1. Login into Sandbox's backend with your Sandbox account.

https://isandbox.alipaydev.com/user/intlAccountDetails.htm

1. After logging in, please check the list on the left and select the corresponding tag, there are 2 situations:
2. To top up the buyer account for oversea's interfaces, click "Global Products" -> "Buyer" -> "Top Up" to top up. The maximum single top up amount is 99999999.99.

1. To top up the buyer account for HK's interfaces, click "Hong Kong Wallet" -> "Buyer" -> "Top Up" to top up. The maximum single top up amount is 99999999.99.

沙箱环境买家账号余额充值步骤如下：

1. 请使用已获取到沙箱环境买家账号的邮箱登陆支付宝国际沙箱平台：https://isandbox.alipaydev.com/user/intlAccountDetails.htm
2. 登陆后，请您查看左侧列表并根据您的账号适用范围选择对应充值。

a.如果您的沙箱环境买家账号用于支付宝国际相关接口，请点击“Global Products”->“Buyer”-> "Top Up"以充值，单次最大充值金额为99999999.99。

b.如果您的沙箱环境买家账号用于支付宝国际-香港相关接口，请点击“Hong Kong Wallet”->“Buyer”-> "Top Up"以充值，单次最大充值金额为99999999.99。