The workaround below for the promo codes should no longer be valid. Promo codes should work just fine right out of the box
If you were supporting promo codes and faced troubled described in #156, you will need to change your workaround code:
errorCode == Constants.BILLING_ERROR_OTHER_ERROR && _billingProcessor.loadOwnedPurchasesFromGoogle() && _billingProcessor.isPurchased(SKU)errorCode needs to be changed to Constants.BILLING_ERROR_INVALID_DEVELOPER_PAYLOAD