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When signing messages or data, you need to properly encode your data:

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Message Signing

For signing messages (personal signatures), encode your data as base64:
TypeScript
const personalSign = async (data: string) => {
  // Encode message as base64
  const message = Buffer.from(data, 'utf-8').toString('base64');
  
  const body = { message_base64: message };
  return await fetch('/v1/wallet/sign/message', { 
    method: 'POST', 
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${YOUR_JWT_TOKEN}`,
      'X-Magic-API-Key': 'YOUR_MAGIC_API_KEY',
      'X-OIDC-Provider-ID': 'YOUR_OIDC_PROVIDER_ID',
      'X-Magic-Chain': 'ETH'
    },
    body: JSON.stringify(body) 
  });
};

​
Data Signing

For signing transaction data or other structured data, provide a keccak256 hash: 
import { typedSignatureHash } from '@metamask/eth-sig-util';

const signTypedDataV1 = async (data: TypedDataV1) => {
  // Compute hash for typed data V1
  const rawDataHash = typedSignatureHash(data);
  
  const body = { raw_data_hash: rawDataHash };
  return await fetch('/v1/wallet/sign/data', { 
    method: 'POST', 
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${YOUR_JWT_TOKEN}`,
      'X-Magic-API-Key': 'YOUR_MAGIC_API_KEY',
      'X-OIDC-Provider-ID': 'YOUR_OIDC_PROVIDER_ID',
      'X-Magic-Chain': 'ETH'
    },
    body: JSON.stringify(body) 
  });
};
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