# Zap repay

Continuing from [/pages/MhRivYPoISvgsUgYmF2I#id-4.-select-an-use-case](https://docs.protocolink.com/lending-sdk/sdk/pages/MhRivYPoISvgsUgYmF2I#id-4.-select-an-use-case "mention").

Zap repay enables users to swap any token to repay the debt in one transaction.

* Source token: the debt token to be repaid.
* Destination token: the token to be provided by user.

## 5. Preview the estimated post-zap-repay portfolio

By specifying the source token, the source token amount, and the destination token, the function will return the destination token amount, the updated user portfolio, and the logics to be executed.

```typescript
// User obtains a quotation for zap repay
const srcToken = mainnetTokens.USDC;
const srcAmount = '1000';
const destToken = mainnetTokens.USDT;
const zapRepayInfo = await adapter.zapRepay({
  account,
  portfolio,
  srcToken,
  srcAmount,
  destToken
});
```

The logic should include:

1. Swap the destination token to the source token
2. Repay the debt with the source token

## 6. Obtain the required approval permission and send the router transaction

To perform the logics, certain approvals need to be processed. You may refer to [Estimate Router Data](/protocolink-sdk/estimate-router-data.md) and [Send Router Transaction](/protocolink-sdk/send-router-transaction.md) for more details.

```typescript
// User needs to permit the Protocolink user agent to borrow for the user
const estimateResult = await apisdk.estimateRouterData(
  { chainId, account, logics: zapRepayInfo.logics }
);

// User obtains a zap repay transaction request
const routerData: apisdk.RouterData = {
  chainId,
  account,
  logics: zapRepayInfo.logics
};
const transactionRequest = await apisdk.buildRouterTransactionRequest(routerData);
```


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