# 支付数据存储费用

```shell
makePayment(wCid, minAmount, fileSize)
```

上传文件后，文件可以按其有效负载 cid 付费。该方法将有效负载 cid 作为第一个参数，将最小数量作为第二个参数。

```shell
require('dotenv').config()
const { mcsSDK } = require('js-mcs-sdk')

// set up js-mcs-sdk
const mcs = new mcsSDK({
  privateKey: process.env.PRIVATE_KEY,
  rpcUrl: process.env.RPC_URL,
})

async function main() {
  // ENTER PARAMETERS
  const W_CID = ''
  const MIN_AMOUNT = '1'
  const FILE_SIZE = ''
   
  const tx = await mcs.makePayment(W_CID, MIN_AMOUNT, FILE_SIZE)
  console.log(tx.transactionHash)
}

main()
```

#### 参数 <a href="#can-shu-1" id="can-shu-1"></a>

* **wCid**：文件的唯一有效负载
* **minAmount**：为文件支付的最低金额。用于避免大数字精度错误的字符串值
* **fileSize**：文件的大小

#### 返回 <a href="#fan-hui-1" id="fan-hui-1"></a>

返回 web3.js接收对象。在上面的示例中，仅打印来自此对象的事务哈希。

<br>


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