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xahau.js/docs/src/prepareTransaction.md.ejs

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## prepareTransaction
`prepareTransaction(transaction: object, instructions: object): Promise<object>`
Prepare a transaction. The prepared transaction must subsequently be [signed](#sign) and [submitted](#submit).
This method works with any of [the transaction types supported by rippled](https://developers.ripple.com/transaction-types.html).
Notably, this is the preferred method for preparing `DepositPreauth` or `AccountDelete` transactions.
### Parameters
Name | Type | Description
---- | ---- | -----------
transaction | [transaction](https://developers.ripple.com/transaction-formats.html) | The specification (JSON) of the transaction to prepare. Set `Account` to the address of the account that is creating the transaction. You may omit auto-fillable fields like `Fee`, `Flags`, and `Sequence` to have them set automatically.
instructions | [instructions](#transaction-instructions) | *Optional* Instructions for executing the transaction.
### Return Value
This method returns a promise that resolves with an object with the following structure:
<aside class="notice">
All "prepare*" methods have the same return type.
</aside>
<%- renderSchema("output/prepare.json") %>
### Example
```javascript
async function preparedPreauth() {
const address = 'r9cZA1mLK5R5Am25ArfXFmqgNwjZgnfk59';
return api.prepareTransaction({
TransactionType: 'DepositPreauth',
Account: address,
Authorize: 'rMyVso4p83khNyHdV1m1PggV9QNadCj8wM'
});
}
```
```javascript
{
txJSON: '{"TransactionType":"DepositPreauth","Account":"r9cZA1mLK5R5Am25ArfXFmqgNwjZgnfk59","Authorize":"rMyVso4p83khNyHdV1m1PggV9QNadCj8wM","Flags":2147483648,"LastLedgerSequence":13561714,"Fee":"12","Sequence":1}',
instructions: {
fee: '0.000012',
sequence: 1,
maxLedgerVersion: 13561714
}
}
```