diff --git a/lib/low_balance.rb b/lib/low_balance.rb
index cf00ec6d169bfe194b1c29a7d88f1f408059a569..e5233db05f039ee206e568186b059661407cdb1a 100644
--- a/lib/low_balance.rb
+++ b/lib/low_balance.rb
@@ -37,6 +37,7 @@ class LowBalance
 			"Your balance of $#{'%.4f' % @customer.balance} is low." \
 			"#{btc_addresses_for_notification}"
 		@customer.stanza_to(m)
+		EMPromise.resolve(0)
 	end
 
 	def btc_addresses_for_notification
@@ -62,20 +63,29 @@ class LowBalance
 			end
 		end
 
+		def failed(e)
+			@message.body =
+				"Automatic top-up transaction for " \
+				"$#{@customer.auto_top_up_amount} failed: #{e.message}"
+			0
+		end
+
 		def notify!
 			sale.then { |tx|
 				@message.body =
 					"Automatic top-up has charged your default " \
 					"payment method and added #{tx} to your balance."
-			}.catch { |e|
-				@message.body =
-					"Automatic top-up transaction for " \
-					"$#{@customer.auto_top_up_amount} failed: #{e.message}"
-			}.then { @customer.stanza_to(@message) }
+				tx.total
+			}.catch(&method(:failed)).then { |amount|
+				@customer.stanza_to(@message)
+				amount
+			}
 		end
 	end
 
 	class Locked
-		def notify!; end
+		def notify!
+			EMPromise.resolve(0)
+		end
 	end
 end
diff --git a/lib/transaction.rb b/lib/transaction.rb
index c88aa11c3d42c3906679451ccedb3d40b43a8c9f..5d55f8f5bed41c168815044e60bd66e93451d9c8 100644
--- a/lib/transaction.rb
+++ b/lib/transaction.rb
@@ -57,6 +57,10 @@ class Transaction
 		end
 	end
 
+	def total
+		amount + bonus
+	end
+
 	def bonus
 		return BigDecimal(0) if amount <= 15