Hash - Documentation

Step 1
String stringToHash = amount=100&callbackUrl=https://checkout.seerbit.com/?m=EQREZEhyRn&country=NG&currency=NGN&email=[email protected].com&paymentReference=5fgj77treo&productDescription=RiceandBeans&productId=Foods&publicKey=EQREZEhyR
Step 2
String hashString = stringToHash + privateKey;
Step 3
Hash = Sha256(hashString);
Hash Algorithm in Java
public static String Sha256(String rawKey) throws ProcessingException {
    try {
      MessageDigest md = MessageDigest.getInstance("SHA-256");
      byte[] encrypted = md.digest(rawKey.getBytes());
      return new String(Hex.encodeHex(encrypted));
    } catch (NoSuchAlgorithmException ex) {
      String errorMessage = "Unable to hash this string";
      throw new ProcessingException(errorMessage);
    }
  }

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Hash Endpoint

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Hash Algorithm in Java