Api call using resttemplate

#1

status=Error&error=Invalid+Hash.++Hash+should+start+with%3a+6D985D

is getting what I do

#2

Can you share a code snippet

#3 
    String url = "https://www.paynow.co.zw/interface/initiatetransaction";

    String merchantId = "merchantId";
    String merchantKey = "merchantKey";
    String reference = "Invoice123";
    String amount = "10.00";
    String returnUrl = "https://www.paynow.co.zw/Home/Home";
    String resultUrl = "https://www.paynow.co.zw/Home/Home";
    String email = "mohammedadil@teleoss.co";
    String status = "Message";

    // Step 1: Build hash string with URL-encoded values
    String postString = "id=" + merchantId
            + "&reference=" + reference
            + "&amount=" + amount
            + "&returnurl=" + URLEncoder.encode(returnUrl, "UTF-8")
            + "&resulturl=" + URLEncoder.encode(resultUrl, "UTF-8")
            + "&authemail=" + URLEncoder.encode(email, "UTF-8")
            + "&status=" + status;

    // Step 2: Create SHA-512 hash
    String hash = DigestUtils.sha512Hex(postString + merchantKey);

    // Step 3: Prepare POST body (no URL encoding here, Spring handles it)
    MultiValueMap<String, String> body = new LinkedMultiValueMap<>();
    body.add("id", merchantId);
    body.add("reference", reference);
    body.add("amount", amount);
    body.add("returnurl", returnUrl);
    body.add("resulturl", resultUrl);
    body.add("authemail", email);
    body.add("status", status);
    body.add("hash", hash);

    System.out.println("Post String for Hash: " + postString);
    System.out.println("Generated Hash: " + hash);

    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

    HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(body, headers);

    RestTemplate restTemplate = new RestTemplate();
    ResponseEntity<String> response = restTemplate.postForEntity(url, request, String.class);

    return ResponseEntity.ok(response.getBody());
#4

Hi @mohammedadil

We highly recommend that you use our Java SDK for integration

or follow the guide here for Hash Generation