# Wallet Builders

> Migration guide for wallet extension developers upgrading to 2.0.

This guide covers the breaking changes for wallet builders implementing the
`@mysten/wallet-standard` interface.

## Key changes

### Removal of `sui:reportTransactionEffects`

The `sui:reportTransactionEffects` feature has been removed entirely. If your wallet implements this
feature, remove it.

### New core API response format

The most significant change is how you obtain BCS-encoded effects for the
`signAndExecuteTransaction` response. The new core API returns effects in a different structure.

## Migrating `signAndExecuteTransaction`

The wallet standard output format hasn't changed. What's different is how you obtain the BCS effects
when using the new Sui client APIs.

```diff
#signAndExecuteTransaction: SuiSignAndExecuteTransactionMethod = async ({
	transaction,
	signal,
}) => {
-	const { bytes, signature } = await Transaction.from(
-		await transaction.toJSON(),
-	).sign({ client: suiClient, signer: keypair });
-
-	const { rawEffects, digest } = await suiClient.executeTransactionBlock({
-		signature,
-		transactionBlock: bytes,
-		options: { showRawEffects: true },
-	});
+	const parsedTransaction = Transaction.from(await transaction.toJSON());
+	const bytes = await parsedTransaction.build({ client });
+
+	const result = await this.#keypair.signAndExecuteTransaction({
+		transaction: parsedTransaction,
+		client,
+	});
+
+	const tx = result.Transaction ?? result.FailedTransaction;

	return {
-		bytes,
-		signature,
-		digest,
-		effects: toBase64(new Uint8Array(rawEffects!)),
+		bytes: toBase64(bytes),
+		signature: tx.signatures[0],
+		digest: tx.digest,
+		effects: toBase64(tx.effects.bcs!),
	};
};
```

Key changes:

- Use `signer.signAndExecuteTransaction()` instead of `suiClient.executeTransactionBlock()`
- Response is a union type - unwrap with `result.Transaction ?? result.FailedTransaction`
- BCS effects are in `tx.effects.bcs` (Uint8Array) instead of `rawEffects` (number array)