diff --git a/lib/cash-in/cash-in-low.js b/lib/cash-in/cash-in-low.js
index 59b3b1d8..0e696fd6 100644
--- a/lib/cash-in/cash-in-low.js
+++ b/lib/cash-in/cash-in-low.js
@@ -8,10 +8,13 @@ const E = require('../error')
 
 const PENDING_INTERVAL_MS = 60 * T.minutes
 
-const massage = _.flow(_.omit(['direction', 'cryptoNetwork', 'bills', 'blacklisted', 'addressReuse']),
+const massageFields = ['direction', 'cryptoNetwork', 'bills', 'blacklisted', 'addressReuse']
+const massageUpdateFields = _.concat(massageFields, 'cryptoAtoms')
+
+const massage = _.flow(_.omit(massageFields),
   convertBigNumFields, _.mapKeys(_.snakeCase))
 
-const massageUpdates = _.flow(_.omit(['cryptoAtoms', 'direction', 'cryptoNetwork', 'bills', 'blacklisted', 'addressReuse']),
+const massageUpdates = _.flow(_.omit(massageUpdateFields),
   convertBigNumFields, _.mapKeys(_.snakeCase))
 
 module.exports = {toObj, upsert, insert, update, massage, isClearToSend}
diff --git a/lib/coin-utils.js b/lib/coin-utils.js
index eee6f306..2fdbd45b 100644
--- a/lib/coin-utils.js
+++ b/lib/coin-utils.js
@@ -12,7 +12,8 @@ const CRYPTO_CURRENCIES = [
     configFile: 'bitcoin.conf',
     daemon: 'bitcoind',
     defaultPort: 8332,
-    unitScale: 8
+    unitScale: 8,
+    displayScale: 5
   },
   {
     cryptoCode: 'ETH',
@@ -21,7 +22,8 @@ const CRYPTO_CURRENCIES = [
     configFile: 'geth.conf',
     daemon: 'geth',
     defaultPort: 8545,
-    unitScale: 18
+    unitScale: 18,
+    displayScale: 15
   },
   {
     cryptoCode: 'LTC',
@@ -30,7 +32,8 @@ const CRYPTO_CURRENCIES = [
     configFile: 'litecoin.conf',
     daemon: 'litecoind',
     defaultPort: 9332,
-    unitScale: 8
+    unitScale: 8,
+    displayScale: 5
   },
   {
     cryptoCode: 'DASH',
@@ -39,7 +42,8 @@ const CRYPTO_CURRENCIES = [
     configFile: 'dash.conf',
     daemon: 'dashd',
     defaultPort: 9998,
-    unitScale: 8
+    unitScale: 8,
+    displayScale: 5
   },
   {
     cryptoCode: 'ZEC',
@@ -48,7 +52,8 @@ const CRYPTO_CURRENCIES = [
     configFile: 'zcash.conf',
     daemon: 'zcashd',
     defaultPort: 8232,
-    unitScale: 8
+    unitScale: 8,
+    displayScale: 5
   },
   {
     cryptoCode: 'BCH',
@@ -57,7 +62,8 @@ const CRYPTO_CURRENCIES = [
     configFile: 'bitcoincash.conf',
     daemon: 'bitcoincashd',
     defaultPort: 8335,
-    unitScale: 8
+    unitScale: 8,
+    displayScale: 5
   }
 ]
 
diff --git a/lib/commission-math.js b/lib/commission-math.js
index a3fc89c0..d02880ed 100644
--- a/lib/commission-math.js
+++ b/lib/commission-math.js
@@ -6,7 +6,7 @@ function truncateCrypto (cryptoAtoms, cryptoCode) {
   const DECIMAL_PLACES = 3
   if (cryptoAtoms.eq(0)) return cryptoAtoms
 
-  const scale = 5 // TODO: change this to coins.displayScale when coins have that attribute
+  const scale = coinUtils.getCryptoCurrency(cryptoCode).displayScale
   const scaleFactor = BN(10).pow(scale)
 
   return BN(cryptoAtoms).truncated().div(scaleFactor)
diff --git a/lib/coupons.js b/lib/coupons.js
index f6bb1254..1c8fdd94 100644
--- a/lib/coupons.js
+++ b/lib/coupons.js
@@ -16,7 +16,7 @@ function createCoupon (code, discount) {
   return db.one(sql, [uuid.v4(), code, discount])
 }
 
-function softDeleteCoupon (couponId) {
+function deleteCoupon (couponId) {
   const sql = `UPDATE coupons SET soft_deleted=true WHERE id=$1`
   return db.none(sql, [couponId])
 }
@@ -26,4 +26,4 @@ function getNumberOfAvailableCoupons () {
   return db.one(sql).then(res => res.count)
 }
 
-module.exports = { getAvailableCoupons, getCoupon, createCoupon, softDeleteCoupon, getNumberOfAvailableCoupons }
+module.exports = { getAvailableCoupons, getCoupon, createCoupon, deleteCoupon, getNumberOfAvailableCoupons }
diff --git a/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodes.js b/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodes.js
index 98ee1f4a..19d2de43 100644
--- a/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodes.js
+++ b/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodes.js
@@ -47,11 +47,12 @@ const Coupons = () => {
   const classes = useStyles()
 
   const [showModal, setShowModal] = useState(false)
+  const [errorMsg, setErrorMsg] = useState(null)
   const toggleModal = () => setShowModal(!showModal)
 
   const { data: couponResponse, loading } = useQuery(GET_COUPONS)
 
-  const [softDeleteCoupon] = useMutation(DELETE_COUPON, {
+  const [deleteCoupon] = useMutation(DELETE_COUPON, {
     refetchQueries: () => ['coupons']
   })
 
@@ -59,8 +60,22 @@ const Coupons = () => {
     refetchQueries: () => ['coupons']
   })
 
-  const addCoupon = (code, discount) => {
-    createCoupon({ variables: { code: code, discount: discount } })
+  const addCoupon = async (code, discount) => {
+    setErrorMsg(null)
+    const res = await createCoupon({
+      variables: { code: code, discount: discount }
+    })
+
+    if (!res.errors) {
+      return setShowModal(false)
+    }
+
+    const duplicateCouponError = res.errors.some(e => {
+      return e.message.includes('duplicate')
+    })
+
+    if (duplicateCouponError)
+      setErrorMsg('There is already a coupon with that code!')
   }
 
   const elements = [
@@ -90,7 +105,7 @@ const Coupons = () => {
       view: t => (
         <IconButton
           onClick={() => {
-            softDeleteCoupon({ variables: { couponId: t.id } })
+            deleteCoupon({ variables: { couponId: t.id } })
           }}>
           <DeleteIcon />
         </IconButton>
@@ -127,7 +142,11 @@ const Coupons = () => {
       )}
       <CouponCodesModal
         showModal={showModal}
-        toggleModal={toggleModal}
+        onClose={() => {
+          setErrorMsg(null)
+          setShowModal(false)
+        }}
+        errorMsg={errorMsg}
         addCoupon={addCoupon}
       />
     </>
diff --git a/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodes.styles.js b/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodes.styles.js
index 32c1571e..0aa04594 100644
--- a/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodes.styles.js
+++ b/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodes.styles.js
@@ -1,14 +1,14 @@
-import { spacer, fontPrimary, primaryColor } from 'src/styling/variables'
+import {
+  spacer,
+  fontPrimary,
+  primaryColor,
+  errorColor
+} from 'src/styling/variables'
 
 const styles = {
   footer: {
     margin: [['auto', 0, spacer * 3, 'auto']]
   },
-  modalTitle: {
-    marginTop: -5,
-    color: primaryColor,
-    fontFamily: fontPrimary
-  },
   modalLabel1: {
     marginTop: 20
   },
@@ -20,7 +20,6 @@ const styles = {
   },
   discountInput: {
     display: 'flex',
-    height: '100%',
     flexDirection: 'row',
     alignItems: 'flex-start'
   },
@@ -33,6 +32,14 @@ const styles = {
   },
   tableWidth: {
     width: 620
+  },
+  error: {
+    color: errorColor
+  },
+  form: {
+    display: 'flex',
+    flexDirection: 'column',
+    height: '100%'
   }
 }
 
diff --git a/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodesModal.js b/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodesModal.js
index 8f832f0c..5588fadc 100644
--- a/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodesModal.js
+++ b/new-lamassu-admin/src/pages/LoyaltyPanel/CouponCodesModal.js
@@ -1,121 +1,106 @@
 import { makeStyles } from '@material-ui/core/styles'
+import { Form, Formik, Field } from 'formik'
 import * as R from 'ramda'
-import React, { useState } from 'react'
+import React from 'react'
+import * as Yup from 'yup'
 
 import Modal from 'src/components/Modal'
 import { Tooltip } from 'src/components/Tooltip'
 import { Button } from 'src/components/buttons'
-import { TextInput, NumberInput } from 'src/components/inputs/base'
-import { H1, H3, TL1, P } from 'src/components/typography'
+import { TextInput, NumberInput } from 'src/components/inputs/formik'
+import { H3, TL1, P } from 'src/components/typography'
 
 import styles from './CouponCodes.styles'
 
 const useStyles = makeStyles(styles)
 
-const CouponCodesModal = ({ showModal, toggleModal, addCoupon }) => {
+const initialValues = {
+  code: '',
+  discount: ''
+}
+
+const validationSchema = Yup.object().shape({
+  code: Yup.string()
+    .required()
+    .trim()
+    .max(25),
+  discount: Yup.number()
+    .required()
+    .min(0)
+    .max(100)
+})
+
+const CouponCodesModal = ({ showModal, onClose, errorMsg, addCoupon }) => {
   const classes = useStyles()
 
-  const [codeField, setCodeField] = useState('')
-  const [discountField, setDiscountField] = useState('')
-  const [invalidCode, setInvalidCode] = useState(false)
-  const [invalidDiscount, setInvalidDiscount] = useState(false)
-
-  const handleCodeChange = event => {
-    if (event.target.value === '') {
-      setInvalidCode(false)
-    }
-    setCodeField(event.target.value)
-  }
-
-  const handleDiscountChange = event => {
-    if (event.target.value === '') {
-      setInvalidDiscount(false)
-    }
-    setDiscountField(event.target.value)
-  }
-
-  const handleClose = () => {
-    setCodeField('')
-    setDiscountField('')
-    setInvalidCode(false)
-    setInvalidDiscount(false)
-    toggleModal()
-  }
-
-  const handleAddCoupon = () => {
-    if (codeField.trim() === '') {
-      setInvalidCode(true)
-      return
-    }
-    if (!validDiscount(discountField)) {
-      setInvalidDiscount(true)
-      return
-    }
-    if (codeField.trim() !== '' && validDiscount(discountField)) {
-      addCoupon(R.toUpper(codeField.trim()), parseInt(discountField))
-      handleClose()
-    }
-  }
-
-  const validDiscount = discount => {
-    const parsedDiscount = parseInt(discount)
-    return parsedDiscount >= 0 && parsedDiscount <= 100
+  const handleAddCoupon = (code, discount) => {
+    addCoupon(R.toUpper(code), parseInt(discount))
   }
 
   return (
     <>
       {showModal && (
         <Modal
+          title="Add coupon code discount"
           closeOnBackdropClick={true}
           width={600}
           height={500}
-          handleClose={handleClose}
+          handleClose={onClose}
           open={true}>
-          <H1 className={classes.modalTitle}>Add coupon code discount</H1>
-          <H3 className={classes.modalLabel1}>Coupon code name</H3>
-          <TextInput
-            error={invalidCode}
-            name="coupon-code"
-            autoFocus
-            id="coupon-code"
-            type="text"
-            size="lg"
-            width={338}
-            onChange={handleCodeChange}
-            value={codeField}
-            inputProps={{ style: { textTransform: 'uppercase' } }}
-          />
-          <div className={classes.modalLabel2Wrapper}>
-            <H3 className={classes.modalLabel2}>Define discount rate</H3>
-            <Tooltip width={304}>
-              <P>
-                The discount rate inserted will be applied to the commissions of
-                all transactions performed with this respective coupon code.
-              </P>
-              <P>
-                (It should be a number between 0 (zero) and 100 (one hundred)).
-              </P>
-            </Tooltip>
-          </div>
-          <div className={classes.discountInput}>
-            <NumberInput
-              error={invalidDiscount}
-              name="coupon-discount"
-              id="coupon-discount"
-              size="lg"
-              width={50}
-              onChange={handleDiscountChange}
-              value={discountField}
-              decimalScale={0}
-              className={classes.discountInputField}
-            />
-            <TL1 inline className={classes.inputLabel}>
-              %
-            </TL1>
-          </div>
-          <div className={classes.footer}>
-            <Button onClick={handleAddCoupon}>Add coupon</Button>
-          </div>
+          <Formik
+            initialValues={initialValues}
+            validationSchema={validationSchema}
+            onSubmit={({ code, discount }, { resetForm }) => {
+              handleAddCoupon(code, discount)
+              resetForm()
+            }}>
+            <Form id="coupon-form" className={classes.form}>
+              <H3 className={classes.modalLabel1}>Coupon code name</H3>
+              <Field
+                name="code"
+                autoFocus
+                size="lg"
+                autoComplete="off"
+                width={338}
+                inputProps={{ style: { textTransform: 'uppercase' } }}
+                component={TextInput}
+              />
+              <div className={classes.modalLabel2Wrapper}>
+                <H3 className={classes.modalLabel2}>Define discount rate</H3>
+                <Tooltip width={304}>
+                  <P>
+                    The discount rate inserted will be applied to the
+                    commissions of all transactions performed with this
+                    respective coupon code.
+                  </P>
+                  <P>
+                    (It should be a number between 0 (zero) and 100 (one
+                    hundred)).
+                  </P>
+                </Tooltip>
+              </div>
+              <div className={classes.discountInput}>
+                <Field
+                  name="discount"
+                  size="lg"
+                  autoComplete="off"
+                  width={50}
+                  decimalScale={0}
+                  className={classes.discountInputField}
+                  component={NumberInput}
+                />
+                <TL1 inline className={classes.inputLabel}>
+                  %
+                </TL1>
+              </div>
+              <span className={classes.error}>{errorMsg}</span>
+              <div className={classes.footer}>
+                <Button type="submit" form="coupon-form">
+                  Add coupon
+                </Button>
+              </div>
+            </Form>
+          </Formik>
         </Modal>
       )}
     </>