diff --git a/lib/constants.js b/lib/constants.js
index 9e526ce6..94bb3138 100644
--- a/lib/constants.js
+++ b/lib/constants.js
@@ -16,6 +16,9 @@ const USER_SESSIONS_CLEAR_INTERVAL = 1 * T.hour
 const AUTOMATIC = 'automatic'
 const MANUAL = 'manual'
 
+const CASH_OUT_DISPENSE_READY = 'cash_out_dispense_ready'
+const CONFIRMATION_CODE = 'sms_code'
+
 module.exports = {
   anonymousCustomer,
   cassetteMaxCapacity,
@@ -25,5 +28,7 @@ module.exports = {
   AUTOMATIC,
   MANUAL,
   USER_SESSIONS_TABLE_NAME,
-  USER_SESSIONS_CLEAR_INTERVAL
+  USER_SESSIONS_CLEAR_INTERVAL,
+  CASH_OUT_DISPENSE_READY,
+  CONFIRMATION_CODE
 }
diff --git a/lib/plugins.js b/lib/plugins.js
index 5b38eb7a..bf53a935 100644
--- a/lib/plugins.js
+++ b/lib/plugins.js
@@ -23,7 +23,7 @@ const customers = require('./customers')
 const commissionMath = require('./commission-math')
 const loyalty = require('./loyalty')
 
-const { cassetteMaxCapacity } = require('./constants')
+const { cassetteMaxCapacity, CASH_OUT_DISPENSE_READY, CONFIRMATION_CODE } = require('./constants')
 
 const notifier = require('./notifier')
 
@@ -361,7 +361,7 @@ function plugins (settings, deviceId) {
 
     const phone = tx.phone
     const timestamp = dateFormat(new Date(), 'UTC:HH:MM Z')
-    return sms.getSms('cash_out_dispense_ready', phone, { timestamp })
+    return sms.getSms(CASH_OUT_DISPENSE_READY, phone, { timestamp })
       .then(smsObj => {
         const rec = {
           sms: smsObj
@@ -723,7 +723,7 @@ function plugins (settings, deviceId) {
       ? '123'
       : randomCode()
 
-    return sms.getSms('sms_code', phone, { code })
+    return sms.getSms(CONFIRMATION_CODE, phone, { code })
       .then(smsObj => {
         const rec = {
           sms: smsObj