private List<Pair<String, String>> getParameters(PayUDetails details) {
List<Pair<String, String>> parameters = new ArrayList<Pair<String, String>>();
parameters.add(new Pair<String, String>("MERCHANT", details.getMerchant()));
parameters.add(new Pair<String, String>("ORDER_REF", details.getReference()));
parameters.add(new Pair<String, String>("ORDER_AMOUNT", details.getAmount()));
parameters.add(new Pair<String, String>("ORDER_CURRENCY", details.getCurrency()));
parameters.add(new Pair<String, String>("IRN_DATE", details.getDate()));
parameters.add(new Pair<String, String>("ORDER_HASH", getHash(details)));
parameters.add(new Pair<String, String>("REF_URL", details.getReferenceUrl()));
return parameters;
}
private String getHash(PayUDetails details) {
StringBuilder hashString = new StringBuilder();
hashString.append(details.getMerchant().length());
hashString.append(details.getMerchant());
hashString.append(details.getReference().length());
hashString.append(details.getReference());
hashString.append(details.getAmount().length());
hashString.append(details.getAmount());
hashString.append(details.getCurrency().length());
hashString.append(details.getCurrency());
hashString.append(details.getDate().length());
hashString.append(details.getDate());
return hmacMD5(hashString.toString(), secretKey);
}