How to do a Razorpay integration in Flutter - flutter

Question

I am able to deploy payment transaction but the server part is very hard. How can I create a orderid and how can we find the payment is done by a specific user?

Answer 1

Hope you set up all the necessary things.
Step 1: creating Order using Razorpay official Order Api:
void createOrder() async {
String username = 'xxxxxxxxxx';// razorpay pay key
String password = "xxxxxxxxxxxxxxxx";// razoepay secret key
String basicAuth =
'Basic ${base64Encode(utf8.encode('$username:$password'))}';
Map<String, dynamic> body = {
"amount": 1 * 100,
"currency": "INR",
"receipt": "rcptid_11"
};
var res = await http.post(
Uri.https(
"api.razorpay.com", "v1/orders"), //https://api.razorpay.com/v1/orders // Api provided by Razorpay Official 💙
headers: <String, String>{
"Content-Type": "application/json",
'authorization': basicAuth,
},
body: jsonEncode(body),
);
if (res.statusCode == 200) {
openCheckout(jsonDecode(res.body)['id']); // 😎🔥
}
print(res.body);
}
//*#################################################################
Step 2: Open Razorpay checkout interface.
After getting orderId from Razorpay official Api, pass the id when calling openCheckout(jsonDecode(res.body)['id']); function
void openCheckout(String orderId) async {
var options = {
'key': 'xxxxxxxxxxxxxxxx',
"amount": 1 * 100,
'order_id': orderId,
'name': 'main.co.in',
// 'prefill': {'contact': '', 'email': 'test#razorpay.com'},
'external': {
'wallets': ['paytm']
}
};
try {
razorpay.open(options);
} catch (e) {
debugPrint('Error: e');
}
}
3rd Step: Signature verification.
This is important if you automatically wanna transfer your amount to your bank account.
for Hmac SHA key , install this package: crypto:
handlerPaymentSuccess(PaymentSuccessResponse response) {
final key = utf8.encode('NgDLPyiDRPuQpcXy1E3GKTDv');
final bytes = utf8.encode('${response.orderId}|${response.paymentId}');
final hmacSha256 = Hmac(sha256, key);
final generatedSignature = hmacSha256.convert(bytes);
if (generatedSignature.toString() == response.signature) {
log("Payment was successful!");
//Handle what to do after a successful payment.
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: const Text("Success : payment successful"),
// content: const Text("Are you sure you wish to delete this item?"),
actions: <Widget>[
ElevatedButton(
onPressed: () {
Navigator.of(context).pop(true);
// PlaceOrderPrepaid();
},
child: Text("OK"))
// ),
],
);
},
);
} else {
log("The payment was unauthentic!");
}
}