<?php
    $parameters = [
        'identifier' => 'DFU80XZIKS',
        'currency' => 'USD',
        'amount' => 100.00,
        'details' => 'Purchase T-shirt',
        'ipn_url' => 'http://example.com/ipn_url.php',
        'cancel_url' => 'http://example.com/cancel_url.php',
        'success_url' => 'http://example.com/success_url.php',
        'public_key' => 'your_public_key',
        'site_logo' => 'https://nanfolo.com/assets/images/logoIcon/logo.png',
        'checkout_theme' => 'dark',
        'customer_name' => 'John Doe',
        'customer_email' => 'john@mail.com',

    ];

    //live end point
    $url = "https://nanfolo.com/payment/initiate";

    //test end point
    $url = "https://nanfolo.com/sandbox/payment/initiate";

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POSTFIELDS,  $parameters);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $result = curl_exec($ch);
    curl_close($ch);

    //$result contains the response back.
?>

//Error Response.
{
    "error": "true",
    "message": "Invalid api key"
}

//Success Response.
{
    "success": "ok",
    "message": "Payment Initiated. Redirect to url.",
    "url":"http://example.com/initiate/payment/checkout?payment_id=eJSAASDxdrt4DASDASVNASJA7893232432cvmdsamnvASF"
}

<?php
    //Receive the response parameter
    $status = $_POST['status'];
    $signature = $_POST['signature'];
    $identifier = $_POST['identifier'];
    $data = $_POST['data'];

    // Generate your signature
    $customKey = $data['amount'].$identifier;
    $secret = 'YOUR_SECRET_KEY';
    $mySignature = strtoupper(hash_hmac('sha256', $customKey , $secret));

    $myIdentifier = 'YOUR_GIVEN_IDENTIFIER';

    if($status == "success" && $signature == $mySignature &&  $identifier ==  $myIdentifier){
        //your operation logic
    }
?>

class NanfoloPayments extends StatefulWidget {
  final String link;
  final String successUrl;
  final String cancelUrl;
  const NanfoloPayments({
    Key? key,
    required this.link,
    required this.successUrl,
    required this.cancelUrl,
  }) : super(key: key);

  @override
  State createState() => _NanfoloPaymentsState();
}

class _NanfoloPaymentsState extends State {
  bool isLoading = true;
  int pressed = 0;

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () async {
        if (pressed < 2) {
          setState(() {
            pressed++;
          });
          final snackBar = SnackBar(
              content: Text(
                  'Press back ${3 - pressed} more times to cancel transaction'));
          ScaffoldMessenger.of(context).showSnackBar(snackBar);
          return false;
        } else {
          return true;
        }
      },
      child: Scaffold(
        body: SizedBox(
          child: Stack(
            children: [
              InAppWebView(
                initialUrlRequest: URLRequest(
                  url: Uri.parse(widget.link),
                ),
                onLoadStart: (controller, url) {},
                onLoadError: (controller, url, code, message) {
                  setState(() {
                    isLoading = false;
                  });
                },
                onLoadStop: (controller, url) {
                  setState(() {
                    isLoading = false;
                  });
                },
                initialOptions: InAppWebViewGroupOptions(
                  crossPlatform: InAppWebViewOptions(
                    useShouldOverrideUrlLoading: true,
                  ),
                ),
                onAjaxReadyStateChange: (controller, ajaxRequest) {
                  log('onAjaxReadyStateChange: ${ajaxRequest.response}');
                  log('onAjaxReadyStateChange: ${ajaxRequest.data}');
                  log('onAjaxReadyStateChange: ${ajaxRequest.status}');

                  return Future.value();
                },
                shouldOverrideUrlLoading: (controller, navigationAction) async {
                  var uri = navigationAction.request.url!;
                  debugPrint(uri.toString());
                  log(uri.toString());
                  //Here we are handling successUrl. Make sure you enter a correct successUrl value from backend and page exists.
                  if (uri.toString() == widget.successUrl) {
                    Navigator.pop(context, true);
                  }
                  if (uri.toString() == widget.cancelUrl) {
                    Navigator.pop(context, false);
                  }
                  return NavigationActionPolicy.ALLOW;
                },
              ),
              if (isLoading)
                const Center(
                  child: CircularProgressIndicator(),
                ),
              // Observer(builder: (context) => LoaderWidget().visible(appStore.isLoading)),
            ],
          ),
        ),
      ),
    );
  }
}

//Calling Webview.
final paymentInitResult =
    await postRequest(API.nanfoloPaymentInitiate(cartId), {"payment_method_id": "5"}, bearerToken: true);
if (json.decode(paymentInitResult.body)['success'] == false) {
    //Some error occured on your backend server API endpoint.
    return false;
}
final responseJson = json.decode(paymentInitResult.body);
//We are calling our webview and waiting for response from it.
final res = await Navigator.push(
  context,
  MaterialPageRoute(
    builder: (context) =>
        NanfoloPayments(link: responseJson['url'], successUrl: responseJson['success_url'], cancelUrl: responseJson['cancel_url']),
  ),
);

if (res != null && res) {
  checkoutNotifier.paymentStatus = 'PAID';
  checkoutNotifier.paymentMeta = {'payBy': 'nanfolo'};
  return true;
} else {
  //If failed tell server to rollback the order!
  final Response cancelResponse = await postRequest(API.nanfoloPaymentCancelled(cartId),
      {"order_id": responseJson!["order_id"].toString()}
      ,bearerToken: true);
  debugPrint("Order Cancelled Response: ${cancelResponse.body}");
  return false;
}

<?php
$curl = curl_init();
curl_setopt_array($curl, array(
    CURLOPT_URL => 'https://nanfolo.com/api/cards?page=1',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 0,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => 'GET',
    CURLOPT_HTTPHEADER => array(
    'Authorization: Bearer {your_secret_key}'
    ),
));
$response = curl_exec($curl);
curl_close($curl);
echo $response;
?>
                                        

<?php
$client = new Client();
$headers = [
    'Content-Type' => 'application/json',
    'Authorization' => 'Bearer {your_secret_key}'
];
$body = '{
    "currency_code": "USD",
    "title": "Some Title",
    "name_on_card": "Nouman Dev",
    "email": "dev@dev.com",
    "amount": "1000"
}';
$request = new Request('POST', 'https://nanfolo.com/api/cards/save', $headers, $body);
$res = $client->sendAsync($request)->wait();
echo $res->getBody();
?>
                                        

<?php
$curl = curl_init();

curl_setopt_array($curl, array(
    CURLOPT_URL => 'https://nanfolo.com/api/cards/{your_card_id}',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 0,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => 'GET',
    CURLOPT_HTTPHEADER => array(
    'Authorization: Bearer {your_secret_key}'
    ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;
?>
                                        

<?php
$curl = curl_init();
curl_setopt_array($curl, array(
    CURLOPT_URL => 'https://nanfolo.com/api/cards/toggle',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 0,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => 'PUT',
    CURLOPT_POSTFIELDS =>'{
    "card_id": "{card_id_here}",
    "active": true 
}',
    CURLOPT_HTTPHEADER => array(
    'Content-Type: application/json',
    'Authorization: Bearer {your_secret_token}'
    ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;
?>
                                        

<?php
$curl = curl_init();
curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://nanfolo.com/api/cards/cancel/{your_card_id}',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'PUT',
  CURLOPT_HTTPHEADER => array(
    'Authorization: Bearer {your_secret_key}'
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response; ?>
                                        

{
    "id": "nf_egqvyf6v0jwr2p1yv8vx",
    "amount": 200,
    "charges": 3,
    "available_balance": 0,
    "title": "Customer 1 Alakba Gift Card",
    "masked_card_number": "************6777",
    "card_number": "8246695135536777",
    "name_on_card": "Customer 1",
    "email": "customer123@gmail.com",
    "cvc": "473",
    "expiry_month": 11,
    "expiry_year": "2025",
    "status": "canceled",
    "created_at": "2023-11-12T11:46:20.000000Z",
    "updated_at": "2023-11-12T14:06:51.000000Z",
    "currency": "USD"
}
                                        

{
    "id": "XPX1ZGF56AVV4",
    "currency_code": "PKR",
    "before_charge": 6000,
    "amount": 6000,
    "charge": 0,
    "type": "-",
    "details": "Payment successful to Test Merchant",
    "remark": "make_payment",
    "created_at": "2023-11-12T16:27:53.000000Z",
    "updated_at": "2023-11-12T16:27:53.000000Z"
}