Implement hasReceipt method

InAppUtils/InAppUtils.m

@@ -129,7 +129,7 @@ - (void)paymentQueue:(SKPaymentQueue *)queue
                 callback(@[@"restore_failed"]);
                 break;
         }
-        
+
         [_callbacks removeObjectForKey:key];
     } else {
         RCTLogWarn(@"No callback registered for restore product request.");
@@ -204,6 +204,13 @@ - (void)paymentQueueRestoreCompletedTransactionsFinished:(SKPaymentQueue *)queue
     callback(@[@(canMakePayments)]);
 }
 
+RCT_EXPORT_METHOD(hasReceipt:(RCTResponseSenderBlock)callback)
+{
+    NSURL *receiptUrl = [[NSBundle mainBundle] appStoreReceiptURL];
+    BOOL hasReceipt = [[NSFileManager defaultManager] fileExistsAtPath:[receiptUrl path]];
+    callback(@[@(hasReceipt)]);
+}
+
 RCT_EXPORT_METHOD(receiptData:(RCTResponseSenderBlock)callback)
 {
     NSURL *receiptUrl = [[NSBundle mainBundle] appStoreReceiptURL];

Readme.md

@@ -111,7 +111,7 @@ InAppUtils.restorePurchases((error, response) => {
       Alert.alert('itunes Error', 'Could not connect to itunes store.');
    } else {
       Alert.alert('Restore Successful', 'Successfully restores all your purchases.');
-      
+
       if (response.length === 0) {
         Alert.alert('No Purchases', "We didn't find any purchases to restore.");
         return;
@@ -148,6 +148,7 @@ iTunes receipts are associated to the users iTunes account and can be retrieved
 ```javascript
 InAppUtils.receiptData((error, receiptData)=> {
   if(error) {
+    // Could also advice the user to restore purchases
     Alert.alert('itunes Error', 'Receipt not found.');
   } else {
     //send to validation server
@@ -157,6 +158,26 @@ InAppUtils.receiptData((error, receiptData)=> {
 
 **Response:** The receipt as a base64 encoded string.
 
+
+### Checking if receipt exists
+
+You can limit user login prompts by checking if the receipt exists before trying to read it.
+Useful if you don't want a prompt for new users
+
+```javascript
+InAppUtils.hasReceipt((exists) => {
+  if(exists) {
+    // Continue with receipt validation before prompting for restoring
+    InAppUtils.receiptData((error, receiptData)=> {
+      //...
+    })
+  }
+});
+```
+
+**Response:** Exists boolean flag.
+
+
 ### Can make payments
 
 Check if in-app purchases are enabled/disabled.