Get Topic Message by ID & Sequence

const response = await fetch('https://mainnet.hedera.validationcloud.io/v1/YOUR_API_KEY/api/v1/topics/{topicId}/messages/{sequenceNumber}', {
    method: 'GET',
    headers: {},
});
const data = await response.json();

{
  "messages": [
    {
      "chunk_info": {
        "initial_transaction_id": "0.0.10-1234567890-000000321",
        "nonce": 3,
        "number": 1,
        "total": 2,
        "scheduled": true
      },
      "consensus_timestamp": "1234567890.000000001",
      "message": "bWVzc2FnZQ==",
      "payer_account_id": "0.0.10",
      "running_hash": "cnVubmluZ19oYXNo",
      "running_hash_version": 2,
      "sequence_number": 1,
      "topic_id": "0.0.7"
    }
  ],
  "links": {
    "next": "/api/v1/transactions?timestamp=lt:1657598275.517984411"
  }
}