Re-query Payment

curl --request POST \
  --url https://xpresspayonlineapisandbox.xpresspayments.com/v1/payments/query \
  --header 'content-type: application/json' \
  --data '{"publicKey": "<YOUR PUBLIC KEY>", "transactionId": "<YOUR TRANSACTION ID>"}'

<?php

$result = array();

$postdata =  array(
  'publicKey' => 'XPPUBK-ead4d14d9ded04aer5d5b63a0a06d2f-X',
  'transactionId' => 'MXX-ASC-4578'
  );

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,"https://xpresspayonlineapisandbox.xpresspayments.com/v1/payments/query");
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 xpresspayonline
  die('Curl returned error: ' . $err);
}


curl_close ($ch);

$result = json_decode($request, true);

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

if('000' == $result->data->payment->paymentResponseCode){
  // 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 REQUERY_ENDPOINT = "https://xpresspayonlineapisandbox.xpresspayments.com/v1/payments/query";

    /**
     *
     * Method to
     *
     * @param paymententity - <b>paymententity - set as a constant with default value as 1</b>
     * @param transactionId - <b>transactionId - is the unique payment reference generated by the merchant.</b>
     * @param publicKey - <b>publicKey - is the merchant public key</b>
     * @param paymentType - <b>PaymentType - is the transaction payment type (CARD/ACCOUNT/QR/USSD/WALLET)</b>
     * @return
     * @throws UnirestException
     */
    public JSONObject verify(String transactionId, String publicKey, double amount, String paymentType) throws UnirestException, Exception {

        // This packages the payload
        JSONObject data = new JSONObject();
        data.put("transactionId", transactionId);
        data.put("publicKey", publicKey)

        // end of payload

        // This sends the request to server with payload
        HttpResponse<JsonNode> response = Unirest.post(REQUERY_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);
        String error = responseObject.optString("error", null);

        // this ensures that status is not null
        if(status == null)
            throw new Exception("Transaction status unknown");

        // This confirms the transaction exist on xpresspayonline
        if(!"null".equalsIgnoreCase(error)){

            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 {transactionId = "MXX-ASC-4578", publicKey = "XPPUBK-e6db11d1f8a6208de8cb2f94e293450e-X"};
            var client = new HttpClient();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            var responseMessage = client.PostAsJsonAsync("https://xpresspayonlineapisandbox.xpresspayments.com/v1/payments/query", data).Result;
            var responseStr = responseMessage.Content.ReadAsStringAsync().Result;
            var response = Newtonsoft.Json.JsonConvert.DeserializeObject<ResponseData>(responseStr);
            if (response.data.payment.paymentResponseCode == "000" && response.data.amount == amount )
            {

              System.Console.WriteLine("Payment Successful then give value");

            }

{
    "status": "SUCCESS",
    "data": {
        "payment": {
            "paymentResponseCode": "000",
            "paymentResponseMessage": "successful",
            "uniqueKey": "6ce13c57aa",
            "transactionId": "null-MXX1-QR-4578",
            "deviceFingerPrint": "69e6b7f0sb72037aa8428b70fbe03986c",
            "cycle": "one-time",
            "amount": "300",
            "currency": "NGN",
            "chargedAmount": "300",
            "appFee": "4.2",
            "merchantFee": "0",
            "merchantBearsFee": "1",
            "chargeCode": "00",
            "chargeMessage": "QR GENERATED. PENDING VALIDATION",
            "authModel": "MVISA-QR",
            "ip": "103.238.105.185",
            "narration": "Xpress Payments",
            "status": "successful",
            "vbvCode": "N/A",
            "vbvMessage": "N/A",
            "authUrl": "NO-URL",
            "accountCode": "00",
            "accountMessage": "successful",
            "paymentType": "mvisa-qr",
            "paymentId": "118",
            "fraudStatus": "ok",
            "chargeType": "normal",
            "createdDay": "1",
            "createdDayName": "MONDAY",
            "createdWeek": "5",
            "createdMonth": "0",
            "createdMonthName": "JANUARY",
            "createdQuarter": "1",
            "createdYear": "2019",
            "createdYearIsLeap": "false",
            "createdDayIsPublicHoliday": "0",
            "createdHour": "11",
            "createdMinute": "8",
            "createdPmAm": "am",
            "created": null,
            "customerId": "79997",
            "customerPhone": "090882232",
            "customerNetworkProvider": "UNKNOWN PROVIDER",
            "customerName": "Ade Test",
            "customerEmail": "[email protected]",
            "customerEmailProvider": "COMPANY EMAIL",
            "customerCreated": "2019-01-28T10:48:51.000Z",
            "accountId": "509",
            "accountBusinessName": "Xpress Payments",
            "accountContactPerson": "Taofeek Gidado",
            "accountCountry": "NG",
            "accountBearsFeeAtTransactionTime": "1",
            "accountParent": "1",
            "accountVpcMerchant": "N/A",
            "accountAlias": null,
            "accountIsLiveApproved": "0",
            "orderReference": "RV46FDC384C30FE0",
            "paymentPlan": null,
            "paymentPage": null,
            "accountNumber": null,
            "bankCode": null,
            "firstName": null,
            "lastName": null,
            "accountIsBlackListed": null,
            "accountToken": null,
            "createdAt": "2019-01-28T11:35:32.61",
            "updatedAt": "2019-01-28T13:03:16.752"
        }
    }
}