Can't find api secret

I have api key but i cannt find api secret on docs it tell about checksum with sha256 of (apiKey+request_token+apiSecret)


I am using the to generate checkSum but I cannot find apiSecret

function generateChecksum({ apiKey, requestToken, apiSecret }: { apiKey: string, requestToken: string, apiSecret: string }) {
const combinedString = `${apiKey}${requestToken}${apiSecret}`;
const hash = crypto.createHash('sha256');
hash.update(combinedString);
return hash.digest('hex');
}