Add method for incrementing consumables without a purchase

MKStoreKit.h

@@ -256,6 +256,19 @@ extern NSString *const kMKStoreKitSubscriptionExpiredNotification;
  */
 - (NSNumber *)consumeCredits:(NSNumber *)creditCountToConsume identifiedByConsumableIdentifier:(NSString *)consumableId;
 
+/*!
+ *  @abstract This method updates the available credits (managed by MKStoreKit) for a given consumable
+ *
+ *  @discussion
+ *	MKStoreKit provides a basic virtual currency manager for your consumables
+ *  This method should only be called if the user earns a credit that doesn't result from a purchase
+ *  A consumable ID is different from its product id, and it is configured in MKStoreKitConfigs.plist file
+ *
+ *  @seealso
+ *  -availableCreditsForConsumable:
+ */
+- (NSNumber *)addCreditsWithoutPurchase:(NSNumber *)creditCountToAdd identifiedByConsumableIdentifier:(NSString *)consumableId {
+
 /*!
  *  @abstract This method sets the default credits (managed by MKStoreKit) for a given consumable
  *

MKStoreKit.m

@@ -175,6 +175,14 @@ - (NSNumber *)consumeCredits:(NSNumber *)creditCountToConsume identifiedByConsum
   return currentConsumableCount;
 }
 
+- (NSNumber *)addCreditsWithoutPurchase:(NSNumber *)creditCountToAdd identifiedByConsumableIdentifier:(NSString *)consumableId {
+    NSNumber *currentConsumableCount = self.purchaseRecord[consumableId];
+    currentConsumableCount = @([currentConsumableCount doubleValue] + [creditCountToAdd doubleValue]);
+    self.purchaseRecord[consumableId] = currentConsumableCount;
+    [self savePurchaseRecord];
+    return currentConsumableCount;
+}
+
 - (void)setDefaultCredits:(NSNumber *)creditCount forConsumableIdentifier:(NSString *)consumableId {
   if (self.purchaseRecord[consumableId] == nil) {
     self.purchaseRecord[consumableId] = creditCount;