Verify Transaction

After integrating Quidpay and a user has successfully paid, you need to verify that the payment was successful with Quidpay before giving value to your customer on your website.

Although the Quidpay inline already verifies the payment from the client side, we strongly recommend you still do a server side verification to be double sure no foul play occurred during the payment flow.

Below are the important things to check for when validating the payment:

Verify the transaction reference.
Verify the status of the transaction to be success.
Verify the chargecode returned in the response to be 00.
Verify the currency to be the expected currency
Most importantly validate the amount paid to be equal to or at least greater than the amount of the value to be given.

Below is sample code of how to implement server side validation in different programming languages.

<?php 

$result = array();

$postdata =  array( 
  'txref' => 'OH-AAED44',
  'SECKEY' => 'FLWSECK-bb971402072265fb156e90a3578fe5e6-X',
  'last_attempt' => '1',
  'only_successful' => '1'
  );

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,"http://flw-pms-dev.eu-west-1.elasticbeanstalk.com/flwv3-pug/getpaidx/api/xrequery");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,json_encode($postdata));  //Post Fields
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$headers = [
  'Content-Type: application/json',
];

curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

$request = curl_exec ($ch);
$err = curl_error($ch);

if($err){
	// there was an error contacting quidpay
  die('Curl returned error: ' . $err);
}


curl_close ($ch);

$result = json_decode($request, true);

if('error' == $result->status){
  // there was an error from the API
  die('API returned error: ' . $result->message);
}

if('successful' == $result->data->status && '00' == $result->data->chargecode){
  // transaction was successful...
  // please check other things like whether you already gave value for this ref
  // If the amount and currency matches the expected amount and currency etc.
  // if the email matches the customer who owns the product etc
  // Give value
}

//Endpoint to verify transaction
    private final String VERIFY_ENDPOINT = "http://flw-pms-dev.eu-west-1.elasticbeanstalk.com/flwv3-pug/getpaidx/api/xrequery"; 
    
    /**
     * 
     * Method to 
     * 
     * @param flwRef - <b>flwRef - is the flutterwave reference returned for the transaction</b>
     * @param txref - <b>txref - is the unique payment reference generated by the merchant.</b>
     * @param secret - <b>secret - is the merchant secret key</b>
     * @return
     * @throws UnirestException 
     */
    public JSONObject verify(String flwRef, String secret, double amount) throws UnirestException, Exception {
        
        // This packages the payload
        JSONObject data = new JSONObject();
        data.put("txref", txref);
        data.put("SECKEY", secret);
        data.put("last_attempt", 1);
        data.put("only_successful", 1);
        
        // end of payload
        
        // This sends the request to server with payload
        HttpResponse<JsonNode> response = Unirest.post(VERIFY_ENDPOINT)
                .header("Content-Type", "application/json")
                .body(data)
                .asJson();
        
        // This get the response from payload
        JsonNode jsonNode = response.getBody();
        
        // This get the json object from payload
        JSONObject responseObject = jsonNode.getObject();
        
        // check of no object is returned
        if(responseObject == null)
            throw new Exception("No response from server");
        
        // This get status from returned payload
        String status = responseObject.optString("status", null);
        
        // this ensures that status is not null
        if(status == null)
            throw new Exception("Transaction status unknown");
        
        // This confirms the transaction exist on quidpay
        if(!"success".equalsIgnoreCase(status)){
            
            String message = responseObject.optString("message", null);
            
            throw new Exception(message);
        }
        
        data = responseObject.getJSONObject("data");
        
        // This get the amount stored on server
        double actualAmount = data.getDouble("amount");
        
        // This validates that the amount stored on client is same returned
        if(actualAmount != amount)
            throw new Exception("Amount does not match");
        
        
        // now you can give value for payment.
       
    }

var data = new { txref = "OH-AAED44", SECKEY = "FLWSECK-e6db11d1f8a6208de8cb2f94e293450e-X", last_attempt = "1", only_successful = "1" };
            var client = new HttpClient();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            var responseMessage = client.PostAsJsonAsync("http://flw-pms-dev.eu-west-1.elasticbeanstalk.com/flwv3-pug/getpaidx/api/xrequery", data).Result;
            var responseStr = responseMessage.Content.ReadAsStringAsync().Result;
            var response = Newtonsoft.Json.JsonConvert.DeserializeObject<ResponseData>(responseStr);
            if (response.data.status == "successful" && response.data.amount == 2000 && response.data.chargecode == "00")
            {
              
              System.Console.WriteLine("Payment Successful then give value");
               
            }