Anticheat methods
- 1.Get response about a completed transaction from the payment system.
- 2.Either send data about the received transaction for verification by calling devtodev anti-cheat methods or use your own tools for transaction verification.
- 3.If the transaction has successfully passed verification, perform the Payment event.
- 4.If the transaction hasn’t passed verification, do not perform the Payment event and mark the user as a cheater.
The devtodev service allows you to validate transactions to prevent fraud from influencing your statistics. For this, you need to integrate
DTDAntiCheat module.We strongly discourage you from using verification results for deciding on allowing or denying users to receive their purchases! Employ this method exclusively for preventing fraud transaction data from being sent to devtodev!
App Store (iOS) Swift
App Store (iOS) Objective-C
Google Play (Kotlin)
Google Play (Java)
Microsoft Store (UWP)
Unity (3 stores )
To validate the transaction you can use the
verifyPayment(completionHandler: @escaping (DTDVerifyResponse) -> Void) method immediately during the transaction processing, e.g.:extension Purchases: SKPaymentTransactionObserver {
func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
for transaction in transactions {
switch transaction.transactionState {
case .purchased:
DTDAntiCheat.verifyPayment { response in
switch response.receiptStatus {
case .receiptInternalError:
// your code
break
case .receiptValid:
// your code
break
case .receiptSandbox:
// your code
break
case .receiptServerError:
// your code
break
case .receiptNotValid:
// your code
break
@unknown default: break
}
SKPaymentQueue.default().finishTransaction(transaction)
}
case .restored:
SKPaymentQueue.default().finishTransaction(transaction)
case .failed:
SKPaymentQueue.default().finishTransaction(transaction)
default:
break
}
}
}
}
The DTDVerifyResponse object returned while validating the transaction has two properties:
Property | Description |
receiptStatus | Enum type DTDReceiptStatus that represents the result of the transaction validation. |
verificationResult | Additional information from the validation server. |
The enum type returned as a result of validation can receive the following values:
Value | Description |
receiptValid | The payment is valid, the transaction is genuine. |
receiptNotValid | The payment is invalid, the transaction may be a duplicate or fraud. |
receiptServerError | Server error when validating the payment. |
receiptSandbox | Test payment. |
receiptInternalError | Internal SDK error. |
We recommend calling the Real Currency Payment method in all cases except when you receive
receiptNotValid or receiptSandbox as a result of the validation.To validate the transaction you can use the
(void)verifyPaymentCompletion:( void (^ _Nonnull)(DTDVerifyResponse * _Nonnull))completionHandler; method immediately during the transaction processing, e.g.:- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions{
for(SKPaymentTransaction *transaction in transactions) {
switch(transaction.transactionState){
case SKPaymentTransactionStatePurchasing: {
// Your code ...
break;
}
case SKPaymentTransactionStatePurchased: {
// Your code ...
[DTDAntiCheat verifyPaymentCompletion:^(DTDVerifyResponse * _Nonnull response) {
switch ([response receiptStatus]) {
case ReceiptStatusReceiptInternalError: {
break;
}
case ReceiptStatusReceiptValid: {
break;
}
case ReceiptStatusReceiptSandbox: {
break;
}
case ReceiptStatusReceiptServerError: {
break;
}
case ReceiptStatusReceiptNotValid: {
break;
}
}
}];
break;
}
case SKPaymentTransactionStateRestored: {
// Your code ...
break;
}
case SKPaymentTransactionStateFailed: {
// Your code ...
break;
}
case SKPaymentTransactionStateDeferred: {
// Your code ...
break;
}
}
}
}
The DTDVerifyResponse object returned while validating the transaction has two properties:
Property | Description |
receiptStatus | Enum type DTDReceiptStatus that represents the result of the transaction validation. |
verificationResult | Additional information from the validation server. |
The enum type returned as a result of validation can receive the following values:
Value | Description |
receiptValid | The payment is valid, the transaction is genuine. |
receiptNotValid | The payment is invalid, the transaction may be a duplicate or fraud. |
receiptServerError | Server error when validating the payment. |
receiptSandbox | Test payment. |
receiptInternalError | Internal SDK error. |
We recommend calling the Real Currency Payment method in all cases except when you receive
receiptNotValid or receiptSandbox as a result of the validation.When GooglePlay sends the transaction back to your
onActivityResult, validate it by calling the following method: verifyPayment(receipt: String, signature: String, publicKey: String, completionHandler:(DTDVerifyResponse) -> Unit) immediately during the transaction processing, e.g.:DTDAntiCheat.verifyPayment(
receipt = "receipt",
signature = "signature",
publickKey = "publickKey"
) { dtdVerifyResponse ->
val verificationResult = dtdVerifyResponse.verificationResult
/* your code here */
when (dtdVerifyResponse.receiptStatus) {
DTDReceiptStatus.ReceiptValid -> { /* your code here */ }
DTDReceiptStatus.ReceiptNotValid -> { /* your code here */ }
DTDReceiptStatus.ReceiptServerError -> { /* your code here */ }
DTDReceiptStatus.ReceiptInternalError -> { /* your code here */ }
}
}
The DTDVerifyResponse object returned while validating the transaction has two properties:
Property | Description |
receiptStatus | Enum type DTDReceiptStatus that represents the result of the transaction validation. |
verificationResult | Additional information from the validation server. |
The enum type returned as a result of validation can receive the following values:
Value | Description |
receiptValid | The payment is valid, the transaction is genuine. |
receiptNotValid | The payment is invalid, the transaction may be a duplicate or fraud. |
receiptServerError | Server error when validating the payment. |
receiptInternalError | Internal SDK error. |
We recommend calling the Real Currency Payment method in all cases except when you receive
receiptNotValid as a result of the validation.When GooglePlay sends the transaction back to your
onActivityResult, validate it by calling the following method: verifyPayment(receipt: String, signature: String, publicKey: String, completionHandler:(DTDVerifyResponse) -> Unit) immediately during the transaction processing, e.g.:DTDAntiCheat.INSTANCE.verifyPayment("receipt", "signature", "publickKey",
dtdVerifyResponse -> {
// your code
switch (dtdVerifyResponse.getReceiptStatus()) {
case ReceiptValid:
// your code
break;
case ReceiptNotValid:
// your code
break;
case ReceiptInternalError:
// your code
break;
case ReceiptServerError:
// your code
break;
}
return null;
});
The DTDVerifyResponse object returned while validating the transaction has two properties:
Property | Description |
receiptStatus | Enum type DTDReceiptStatus that represents the result of the transaction validation. |
verificationResult | Additional information from the validation server. |
The enum type returned as a result of validation can receive the following values:
Value | Description |
receiptValid | The payment is valid, the transaction is genuine. |
receiptNotValid | The payment is invalid, the transaction may be a duplicate or fraud. |
receiptServerError | Server error when validating the payment. |
receiptInternalError | Internal SDK error. |
We recommend calling the Real Currency Payment method in all cases except when you receive
receiptNotValid as a result of the validation.devtodev sends a request for transaction verification to the payment platform and then forwards the answer to the app.
To validate the transaction you can use the
Task<DTDReceiptStatus> VerifyPayment(string: receipt) method. As an argument pass the PurchaseResults.ReceiptXml property. More information about it here.Example of verification:
var result = await DTDAntiCheat.VerifyPayment("receipt");
switch (result)
{
case DTDReceiptStatus.Valid:
break;
case DTDReceiptStatus.Invalid:
break;
case DTDReceiptStatus.ServerError:
break;
case DTDReceiptStatus.InternalError:
break;
default:
throw new ArgumentOutOfRangeException();
}
The DTDVerifyResponse object returned while validating the transaction has two properties:
Property | Description |
ReceiptStatus | Enum type DTDReceiptStatus that represents the result of the transaction validation. |
VerificationResult | Additional information from the validation server. |
The enum type returned as a result of validation can receive the following values:
Value | Description |
Valid = 0L | The payment is valid, the transaction went through successfully |
Invalid = 1L | The payment is invalid, the transaction may be a duplicate or fraud |
ServerError = 2L | Server error when validating the payment |
InternalError = 4L | Internal SDK error |
We recommend calling the Real Currency Payment method in all cases except when you receive
Invalid as a result of the validation.If you use Unity IAP for payment validation, call the following method:
void VerifyPayment(string publicKey, string receipt, Action completionHandler)Example:
public PurchaseProcessingResult ProcessPurchase (PurchaseEventArgs e)
{
DTDAntiCheat.VerifyPayment(yourPublicKey, e.purchasedProduct.receipt, result =>
{
if (result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptValid ||
result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptInternalError ||
result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptServerError)
{
// Code for valid result.
}
else
{
// Code for invalid result.
}
});
}
To validate data received from Google play, use
void VerifyPayment(string publicKey, string receipt, string signature,Action<DTDVerifyResponse> completionHandler) when handling the transaction.public void MyNativeCallback (string publicKey, string receipt, string signature)
{
DTDAntiCheat.VerifyPayment(publicKey, receipt, signature, result =>
{
if (result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptValid ||
result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptInternalError ||
result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptServerError)
{
// Code for valid result.
}
else
{
// Code for invalid result.
}
});
}
Here's how to find your app's public key for licensing (for Google Play platform only, for other platforms the publicKey is not used):
- 1.Go to the Google Play Console and sign in. Make sure that you sign in to the account from which the app you are licensing is published (or will be published).
- 2.In the app details page, locate the Services & APIs link and click it.
- 3.In the Services & APIs page, locate the Licensing & In-App Billing section. Your public key for licensing is given in the Your License Key For This Application field.
If you use Unity IAP for payment validation, call the following method:
void VerifyPayment(string receipt, Action completionHandler)public PurchaseProcessingResult ProcessPurchase (PurchaseEventArgs e)
{
DTDAntiCheat.VerifyPayment(e.purchasedProduct.receipt, result =>
{
if (result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptValid ||
result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptInternalError ||
result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptServerError)
{
// Code for valid result.
}
else
{
// Code for invalid result.
}
});
}
If you use Unity IAP for payment validation, call the following method:
void VerifyPayment(string receipt, Action completionHandler)public PurchaseProcessingResult ProcessPurchase (PurchaseEventArgs e)
{
DTDAntiCheat.VerifyPayment(e.purchasedProduct.receipt, result =>
{
if (result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptValid ||
result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptInternalError ||
result.ReceiptStatus == DTDReceiptVerificationStatus.ReceiptServerError)
{
// Code for valid result.
}
else
{
// Code for invalid result.
}
});
}
N.B. You can pass a native XML recipe to the receipt argument.
The DTDVerifyResponse object returned while validating the transaction has two properties:
Property | Description |
receiptStatus | Enum type DTDReceiptStatus that represents the result of the transaction validation. |
verificationResult | Additional information from the validation server. |
The enum type returned as a result of validation can receive the following values:
Value | Description |
receiptValid | The payment is valid, the transaction is genuine. |
receiptNotValid | The payment is invalid, the transaction may be a duplicate or fraud. |
receiptServerError | Server error when validating the payment. |
receiptSandbox | Test payment. |
receiptInternalError | Internal SDK error. |
We recommend calling the Real Currency Payment method in all cases except when you receive
receiptNotValid or receiptSandbox as a result of the validation.
Last modified 6mo ago