<p>Declines a handshake request. This sets the handshake state to <code>DECLINED</code> and effectively deactivates the request.</p> <p>This operation can be called only from the account that received the handshake. The originator of the handshake can use <a>CancelHandshake</a> instead. The originator can't reactivate a declined request, but can reinitiate the process with a new handshake request.</p> <p>After you decline a handshake, it continues to appear in the results of relevant APIs for only 30 days. After that, it's deleted.</p>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}