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The client does not prepare wallet operations. It only signs prepared transactions.

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What to look for

If a prepared transaction has signatureRequests.length > 0, the client still needs to sign it before submission.

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Ed25519 signing

For normal Solana-key signing, use signPreparedTransaction(...): 
import {
  signPreparedTransaction,
  type PreparedTransaction,
} from '@swig-wallet/developer-sdk/client';
import { VersionedTransaction } from '@solana/web3.js';

declare const prepared: PreparedTransaction;

const signed = await signPreparedTransaction(prepared, {
  signTransaction: async (transaction) => {
    const versioned = VersionedTransaction.deserialize(
      Buffer.from(transaction, 'base64'),
    );
    versioned.sign([userKeypair]);
    return Buffer.from(versioned.serialize()).toString('base64');
  },
});

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Secp256r1 and passkeys

For passkey-backed prepared transactions, use the Swig signing helpers: 
import {
  createSecp256r1PasskeySigningFn,
  signPreparedSwigTransaction,
} from '@swig-wallet/developer-sdk/client';

const passkeySigningFn = createSecp256r1PasskeySigningFn({
  allowCredentials: [{ id: credentialId, type: 'public-key' }],
  userVerification: 'preferred',
});

const signed = await signPreparedSwigTransaction(prepared, {
  secp256r1: passkeySigningFn,
});

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Secp256k1 and EVM wallets

For EVM-backed prepared transactions, use the EVM helper. It wraps an EIP-1193 provider with personal_sign and adds the Ethereum message prefix expected by Swig’s secp256k1 authority payload. 
import {
  createSecp256k1EvmSigningFn,
  signPreparedSwigTransaction,
  type PreparedTransaction,
} from '@swig-wallet/developer-sdk/client';

declare const prepared: PreparedTransaction;
declare const evmAddress: string;

const evmSigningFn = createSecp256k1EvmSigningFn({
  provider: window.ethereum,
  address: evmAddress,
});

const signed = await signPreparedSwigTransaction(prepared, {
  secp256k1: evmSigningFn,
});

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After signing

Once the client has signed the required transactions, your app can send them directly or hand them to Sponsor & Submit.