I am trying to sign my payload using SHA512withRsa but I am facing issues while verifying the signature can anyone please help me

I want to know what is going wrong in my code is my generating signature code wrong or verifying code wrong

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Code for signing my payload

keystore = getPrivateKeystore(privateKeyPath, keystorePassowrd. toCharArray));

    privateKey = getPrivateKey(privateKeyAlias, privateKeyPassword. toCharArray(), keystore);
    
    MessageDigest digest = MessageDigest. getInstance("SHA512", "BC");
    
    byte[] newDigest = digest. digest (data);
    
    
    
    Signature signature = Signature. getInstance( "SHA512withRSA/PSS", "BC");
    
   
    
    signature. initSign(privateKey);
    
    
    
    signature.update(newDigest);
    
    
    
    byte[] sign = signature.sign();
    
   
    System. out.println(String. valueOf(sign));
    
    
    
    return Base64.getEncoder(). encodeToString(sign);

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code for verifying signature

public boolean verifySignature (String paload, String signature)throws NoSuchAlgorithmException,

NoSuchProviderException,InvalidAlgorithmParameterException,InvalidKeyException,SignatureException,UnrecoverableKeyException,
KeyStoreEx

Signature ver=Signature.getInstance(“SHA512withRSA/PSS”,”BC”);

ver.initVerify(getPublicKey(publicKeyAlias, keystore));

ver. update(payload.getBytes));

byte[] decode = Base64.getDecoder().decode(signature);

System. out. println(String. valuef(decode));

boolean verify = ver.verify(Base64.getDecoder().decode(signature));

System. out. println (verify);

return verify;

I tried signing my payload with SHA512withRSA algo but I am not able to verify .

I just want to know where I am making mistake is it in my genertaing signature code or verifying code