diff --git a/src/lib/components/ErrorStack.svelte b/src/lib/components/ErrorStack.svelte
new file mode 100644
index 0000000..adb9b5b
--- /dev/null
+++ b/src/lib/components/ErrorStack.svelte
@@ -0,0 +1,105 @@
+<script lang="ts">
+  import { fade, fly, slide } from 'svelte/transition';
+  import type IOrderValidationError from '$lib/interfaces/IOrderValidationError';
+
+  export let errors: string[] = [];
+  let currentCard = 0;
+  let debounce = false;
+  const flyoutDuration = 425;
+
+  function offsetTop(index: number) {
+    const randomVal = Math.round(Math.random() * 20 * Math.random() > 0.5 ? 1 : -1);
+    return `top: ${
+      -7 * index
+    }px; transform: translate(${randomVal}px,${randomVal}px) rotate(${randomVal}deg)`;
+  }
+
+  function dismiss(index: number) {
+    debounce = true;
+    errors = errors?.filter((m, i) => i !== index);
+    setTimeout(() => (debounce = false), flyoutDuration);
+  }
+</script>
+
+{#if errors && errors?.length > 0}
+  <section style="position: relative;">
+    {#each errors as error, index (`${index}-${error}`)}
+      <p
+        class="error-card"
+        data-status="{index === currentCard ? 'current' : 'waiting'}"
+        style="{offsetTop(index)}"
+        in:slide out:fly="{{ y: 100, duration: flyoutDuration }}"
+      >
+        <button
+          class="dismiss"
+          on:click="{() => dismiss(index)}"
+          on:keyup="{(e) => e.code === 'Enter' && debounce === false && dismiss(index)}">X</button
+        >
+
+        <span class="card_content">{error}</span>
+        <span class="help"
+          >Prøv igjen eller gi en lyd på <a class="link" href="mailto:kontakt@planetposen.no"
+            >kontakt@planetposen.no</a
+          > så tar vi kontakt med deg.</span
+        >
+      </p>
+    {/each}
+  </section>
+{/if}
+
+<style lang="scss">
+  .error-card {
+    position: absolute;
+    -webkit-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
+    box-sizing: border-box;
+    touch-action: none;
+    background-color: rgba(255, 0, 0, 0.6);
+    color: var(--color-theme-1);
+    font-size: 1.1rem;
+    padding: 1rem 1.25rem;
+    margin: 0.5rem 0;
+    display: flex;
+    flex-direction: column;
+    border-radius: 4px;
+    width: 100%;
+    max-width: 550px;
+    transition: all 0.6s ease;
+    border: 1px solid firebrick;
+
+    &[data-status='current'] {
+      z-index: 2;
+      // background-color: orange;
+      background-color: #ff3333;
+      border-color: transparent;
+    }
+
+    span {
+      display: block;
+      color: white;
+      font-size: 1.2rem;
+      padding: 0.4rem 0 0.4rem;
+    }
+
+    button.dismiss {
+      position: absolute;
+      top: 0.5rem;
+      right: 1rem;
+      font-size: 1.3rem;
+      color: white;
+      cursor: pointer;
+      border: none;
+      margin: 0;
+      padding: 0;
+      background: none;
+    }
+
+    .help {
+      color: rgba(0, 0, 0, 0.7);
+      font-size: 0.95rem;
+      // margin-top: 1.2rem;
+    }
+  }
+</style>
diff --git a/src/lib/components/StripeCard.svelte b/src/lib/components/StripeCard.svelte
index 5290be3..5edf616 100644
--- a/src/lib/components/StripeCard.svelte
+++ b/src/lib/components/StripeCard.svelte
@@ -1,11 +1,15 @@
 <script lang="ts">
-  import { onDestroy, onMount } from 'svelte';
-  import { loadStripe } from '@stripe/stripe-js/pure';
-  import type { Stripe } from '@stripe/stripe-js';
-  import { cart } from '../cartStore';
+  import { onMount } from 'svelte';
+  import stripeApi from '$lib/stripe/index';
+  import type { StripeCardElement } from '@stripe/stripe-js/types';
 
-  function mountCard() {
-    const elements = stripe.elements();
+  export let card: StripeCardElement;
+  export let stripeApiKey: string;
+
+  async function mountCard() {
+    let stripe = await stripeApi.load(stripeApiKey);
+    const elements = stripe?.elements();
+    if (!elements) return;
 
     const options = {
       hidePostalCode: true,
@@ -27,61 +31,9 @@
     card.mount(cardElement);
   }
 
-  // function makeIntent() {
-  //   let url = "/api/payment/stripe";
-  //   if (window.location.href.includes("localhost"))
-  //     url = "http://localhost:30010".concat(url);
+  onMount(() => mountCard());
 
-  //   fetch(url, {
-  //     method: "POST",
-  //     headers: {
-  //       "Content-Type": "application/json",
-  //     },
-  //     body: JSON.stringify({
-  //       cart: $cart
-  //     })
-  //   })
-  //     .then((resp) => resp.json())
-  //     .then((data) => (clientSecret = data.paymentIntent.clientSecret));
-  // }
-
-  function pay() {
-    stripe
-      .confirmCardPayment(clientSecret, {
-        payment_method: {
-          card,
-          billing_details: {
-            name: 'Kevin Testost'
-          }
-        }
-      })
-      .then((result) => {
-        if (result.error) {
-          confirmDiag.innerText = result.error.message || 'Unexpected payment ERROR!';
-        } else {
-          if (result.paymentIntent.status === 'succeeded') {
-            confirmDiag.innerText = 'Confirmed transaction!';
-          }
-        }
-      });
-  }
-
-  async function initStripe() {
-    window.addEventListener('submit-stripe-payment', pay, false);
-
-    loadStripe.setLoadParameters({ advancedFraudSignals: false });
-    stripe = await loadStripe('pk_test_YiU5HewgBoClZCwHdhXhTxUn');
-    mountCard();
-    // makeIntent();
-  }
-
-  onMount(() => initStripe());
-  // onDestroy(() => window.removeEventListener('submit-stripe-payment', null))
-
-  let stripe: Stripe;
-  let card;
   let cardElement: HTMLElement;
-  let clientSecret: string;
   let confirmDiag: HTMLElement;
 </script>
 
@@ -96,7 +48,6 @@
 
   .card {
     // padding: 1rem;
-    margin: 0 0.5rem;
     border: 2px solid black;
 
     @include desktop {
diff --git a/src/lib/interfaces/IOrderValidationError.ts b/src/lib/interfaces/IOrderValidationError.ts
new file mode 100644
index 0000000..9cd620e
--- /dev/null
+++ b/src/lib/interfaces/IOrderValidationError.ts
@@ -0,0 +1,5 @@
+export default interface IOrderValidationError {
+  type: string;
+  field: number | string;
+  message: string;
+}
diff --git a/src/lib/stripe/index.ts b/src/lib/stripe/index.ts
new file mode 100644
index 0000000..77d4942
--- /dev/null
+++ b/src/lib/stripe/index.ts
@@ -0,0 +1,100 @@
+import { buildApiUrl } from '$lib/utils/apiUrl';
+import { loadStripe } from '@stripe/stripe-js/pure';
+import type {
+  ConfirmCardPaymentData,
+  PaymentIntentResult,
+  Stripe,
+  StripeError
+} from '@stripe/stripe-js';
+
+let stripeInstance: Stripe;
+
+class StripeUnableToAccepPaymentsError extends Error {
+  constructor() {
+    const message = 'Card failed to load or never got a client secret. Unable to accept payments';
+    super(message);
+  }
+}
+
+// class StripePaymentError extends Error {
+//   code: string | undefined
+//   type: string
+
+//   constructor(error: StripeError) {
+//     const message = error.message || 'Unexptected error from stripe';
+//     super(message);
+
+//     console.log('stripe error:', error);
+//     this.code = error.code;
+//     this.type = error.type;
+//   }
+// }
+
+class StripeMissingPaymentIntent extends Error {
+  constructor() {
+    const message = 'Stripe responded without payment intent';
+    super(message);
+  }
+}
+
+// Calls backend for a client secret. order_id & customer_no
+// is sent to attach to stripe payment intent
+function clientSecret(order_id: string, customer_no: string): Promise<string> {
+  const url = buildApiUrl('/api/v1/payment/stripe');
+  const options = {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json'
+    },
+    body: JSON.stringify({ order_id, customer_no })
+  };
+
+  return fetch(url, options)
+    .then((resp) => resp.json())
+    .then((data) => data?.clientSecret);
+}
+
+// Creates stripe instance from package: @stripe/stripe-js
+async function load(apiKey: string): Promise<Stripe | undefined> {
+  if (stripeInstance) return stripeInstance;
+
+  loadStripe.setLoadParameters({ advancedFraudSignals: false });
+  const stripe: Stripe | null = await loadStripe(apiKey);
+  if (!stripe) {
+    console.error('Unable to load stripe payment');
+    return;
+  }
+
+  stripeInstance = stripe;
+  return stripe;
+}
+
+// Uses @stripe/stripe-js to make payment request from
+// stripe Elements directly to Stripe. Server receives
+// async webhook updates from Stripe.
+function pay(secret: string, data: ConfirmCardPaymentData) {
+  if (!clientSecret || !stripeInstance) {
+    throw new StripeUnableToAccepPaymentsError();
+  }
+
+  return stripeInstance
+    .confirmCardPayment(secret, data)
+    .then((stripePaymentResponse: PaymentIntentResult) => {
+      const { error, paymentIntent } = stripePaymentResponse;
+
+      if (error) {
+        throw error;
+      } else if (paymentIntent) {
+        console.log('payment intent from stripe:', paymentIntent);
+        return paymentIntent.status === 'succeeded';
+      }
+
+      throw new StripeMissingPaymentIntent();
+    });
+}
+
+export default {
+  clientSecret,
+  load,
+  pay
+};
diff --git a/src/lib/utils/apiUrl.ts b/src/lib/utils/apiUrl.ts
new file mode 100644
index 0000000..6783bfd
--- /dev/null
+++ b/src/lib/utils/apiUrl.ts
@@ -0,0 +1,14 @@
+import { dev, browser } from '$app/environment';
+
+const LOCALHOST_API = 'http://localhost:30010';
+
+export function buildApiUrl(path: string) {
+  let localhostApi = false;
+
+  if (dev) localhostApi = true;
+  if (browser && window?.location?.href.includes('localhost')) {
+    localhostApi = true;
+  }
+
+  return localhostApi ? LOCALHOST_API.concat(path) : path;
+}
diff --git a/src/routes/checkout/+page.server.ts b/src/routes/checkout/+page.server.ts
new file mode 100644
index 0000000..0fee320
--- /dev/null
+++ b/src/routes/checkout/+page.server.ts
@@ -0,0 +1,8 @@
+import { env } from '$env/dynamic/private';
+import type { PageServerLoad } from './$types';
+
+export const load: PageServerLoad = () => {
+  return {
+    stripeApiKey: env.STRIPE_API_KEY || ''
+  };
+};
diff --git a/src/routes/checkout/+page.svelte b/src/routes/checkout/+page.svelte
index afdc8dd..918d689 100644
--- a/src/routes/checkout/+page.svelte
+++ b/src/routes/checkout/+page.svelte
@@ -1,36 +1,140 @@
 <script lang="ts">
+  import { goto } from '$app/navigation';
   import OrderSection from './OrderSection.svelte';
   import DeliverySection from './DeliverySection.svelte';
   import PageMeta from '$lib/components/PageMeta.svelte';
   import CheckoutButton from '$lib/components/Button.svelte';
   import StripeCard from '$lib/components/StripeCard.svelte';
-  import ApplePayButton from '$lib/components/ApplePayButton.svelte';
-  import VippsHurtigkasse from '$lib/components/VippsHurtigkasse.svelte';
+  import ErrorStack from '$lib/components/ErrorStack.svelte';
   import { cart } from '$lib/cartStore';
+  import stripeApi from '$lib/stripe/index';
+  import { OrderSubmitUnsuccessfullError } from '$lib/errors/OrderErrors';
+  import Loading from '$lib/components/loading/index.svelte';
+  import { addBadElement, removeBadElements } from './validation';
+  import { buildApiUrl } from '$lib/utils/apiUrl';
+  import type { StripeCardElement } from '@stripe/stripe-js/types';
+  import type ICustomer from '$lib/interfaces/ICustomer';
+  import type IOrderValidationError from '$lib/interfaces/IOrderValidationError';
+  import type {
+    IOrderCreateDTO,
+    IOrderCreateResponse,
+    IOrderCreateUnsuccessfullResponse
+  } from '$lib/interfaces/ApiResponse';
+  import type { PageData } from './$types';
 
-  function postOrder(event: any) {
-    const formData = new FormData(event.target);
+  export let data: PageData;
+  export let stripeApiKey: string = data.stripeApiKey;
 
-    const customerJson = {};
-    formData.forEach((value, key) => (customerJson[key] = value));
+  let card: StripeCardElement;
+  let form: HTMLFormElement;
+  let errors: string[] = [];
 
-    const options = {
-      method: 'POST',
-      body: JSON.stringify({
-        customer: customerJson,
-        cart: $cart
-      }),
-      headers: {
-        'Content-Type': 'application/json'
-      }
-    };
+  /* eslint-disable @typescript-eslint/no-explicit-any */
+  let resolvePaymentPromise: (value: any) => void;
+  let rejectPaymentPromise: (resason: any | null) => void;
+  let paymentPromise: Promise<any>;
+  /* eslint-enable @typescript-eslint/no-explicit-any */
 
-    let url = '/api/order';
-    if (window?.location?.href.includes('localhost')) {
-      url = 'http://localhost:30010'.concat(url);
+  function startPaymentLoader() {
+    paymentPromise = new Promise((resolve, reject) => {
+      resolvePaymentPromise = resolve;
+      rejectPaymentPromise = reject;
+    });
+  }
+
+  function handleSubmitOrderError(error: IOrderCreateUnsuccessfullResponse) {
+    console.log('got error from order api!', error, error?.validationErrors);
+    const { success, validationErrors } = error;
+
+    if (!validationErrors || validationErrors?.length == 0) {
+      errors.push('Ukjent feil ved plassering av ordre.');
+      return;
     }
 
-    fetch(url, options);
+    validationErrors.forEach((verror) => {
+      errors.push(verror.message);
+
+      const l = document.getElementById(String(verror.field));
+      if (l) addBadElement(l, verror);
+    });
+  }
+
+  function handleStripePaymentError(error: Error) {
+    rejectPaymentPromise('error');
+    errors = [...errors, 'Betalingsfeil fra stripe: ' + error.message];
+  }
+
+  function getCustomerFromFormData(formData: FormData): ICustomer {
+    let zip_code: string | number = formData.get('zip_code') as string;
+    if (!isNaN(parseInt(zip_code))) {
+      zip_code = parseInt(zip_code);
+    } else {
+      zip_code = 0;
+    }
+
+    return {
+      email: formData.get('email') as string,
+      first_name: formData.get('first_name') as string,
+      last_name: formData.get('last_name') as string,
+      street_address: formData.get('street_address') as string,
+      zip_code,
+      city: formData.get('city') as string
+    };
+  }
+
+  async function postOrder(event: SubmitEvent) {
+    const formData = new FormData(event.target as HTMLFormElement);
+    const customer = getCustomerFromFormData(formData);
+
+    const orderData: IOrderCreateDTO = { customer, cart: $cart };
+    const options = {
+      method: 'POST',
+      body: JSON.stringify(orderData),
+      headers: { 'Content-Type': 'application/json' }
+    };
+
+    const url = buildApiUrl('/api/v1/order');
+
+    // TODO catch error
+    let orderResponse: IOrderCreateResponse;
+    try {
+      orderResponse = await fetch(url, options).then((resp) => resp.json());
+
+      errors = [];
+      removeBadElements();
+      if (orderResponse?.success !== true) {
+        throw new OrderSubmitUnsuccessfullError(orderResponse as IOrderCreateUnsuccessfullResponse);
+      }
+    } catch (error: any) {
+      handleSubmitOrderError(error);
+      return;
+    }
+
+    // TODO catch error
+    startPaymentLoader();
+    let stripePaymentResponse;
+    try {
+      const stripeClientSecret = await stripeApi.clientSecret(
+        orderResponse?.order_id,
+        orderResponse?.customer_no
+      );
+
+      stripePaymentResponse = await stripeApi.pay(stripeClientSecret, {
+        payment_method: {
+          card,
+          billing_details: {
+            name: `${customer.first_name} ${customer.last_name}`
+          }
+        }
+      });
+
+      if (stripePaymentResponse) {
+        resolvePaymentPromise(true);
+        goto(`/receipt/${orderResponse?.order_id}`);
+      }
+    } catch (error: any) {
+      return handleStripePaymentError(error);
+    }
   }
 </script>
 
@@ -39,8 +143,8 @@
   description="Kasse for bestilling og betaling av produkter i handlekurven"
 />
 
-<h1>Checkout</h1>
-<form class="checkout" on:submit|preventDefault="{postOrder}">
+<h1>Kassen</h1>
+<form class="checkout" bind:this="{form}" on:submit|preventDefault="{postOrder}">
   <section id="delivery">
     <h2>Leveringsaddresse</h2>
     <DeliverySection />
@@ -48,31 +152,30 @@
 
   <section id="order">
     <h2>Din ordre</h2>
-    <OrderSection>
-      <div class="navigation-buttons" slot="button">
-        <ApplePayButton />
-        <VippsHurtigkasse />
-      </div>
-    </OrderSection>
+    <OrderSection />
   </section>
 
   <section id="payment">
     <h2>Betalingsinformasjon</h2>
-    <StripeCard />
+    <StripeCard bind:card="{card}" stripeApiKey="{stripeApiKey}" />
 
     <div class="pay">
       <CheckoutButton type="submit" text="Betal" />
+      <div class="payment-state-animation">
+        {#if paymentPromise}
+          <Loading promise="{paymentPromise}" />
+        {/if}
+      </div>
     </div>
   </section>
 </form>
 
+<ErrorStack bind:errors="{errors}" />
+
 <style lang="scss" module="scoped">
   @import '../../styles/media-queries.scss';
 
   form.checkout {
-    // display: flex;
-    // flex-wrap: wrap;
-
     display: grid;
     grid-template-areas:
       'delivery order'
@@ -80,7 +183,6 @@
 
     grid-gap: 2rem;
     grid-template-columns: 1fr 1fr;
-    // grid-auto-flow: column;
 
     @include mobile {
       grid-template-columns: minmax(0, 1fr);
@@ -93,18 +195,12 @@
 
   .pay {
     margin: 2rem 0;
-  }
-
-  .navigation-buttons {
     display: flex;
-    justify-content: flex-start;
-    margin-top: 2rem;
-    flex-wrap: wrap;
   }
 
-  :global(.navigation-buttons > *) {
-    margin-right: 1rem;
-    margin-bottom: 1rem;
+  :global(.pay .payment-state-animation svg) {
+    margin-left: 1.5rem;
+    width: 34px;
   }
 
   #delivery {
@@ -126,10 +222,30 @@
       padding-left: 4px;
       text-transform: none;
       font-size: 2.3rem;
-      padding: 12px 10px 12px 12px !important;
+      padding: 12px 10px 12px 0;
       font-weight: 500;
       color: #231f20;
       line-height: 1.1;
     }
   }
+
+  :global(.bad-msg) {
+    position: absolute;
+    left: 0;
+    margin-top: -2.3rem;
+    padding: 0.5rem;
+    background-color: #ff3333;
+    color: white;
+  }
+
+  :global(.bad-form) {
+    // border: 2px solid var(--color-theme-1);
+    background-color: rgba(255, 0, 0, 0.1);
+    color: var(--color-theme-1);
+    font-size: 1.1rem;
+    padding: 0.5rem;
+    margin: -0.5rem;
+    position: relative;
+    border-color: rgba(255, 0, 0, 0.1);
+  }
 </style>
diff --git a/src/routes/checkout/OrderSection.svelte b/src/routes/checkout/OrderSection.svelte
index 33744ab..e61d68c 100644
--- a/src/routes/checkout/OrderSection.svelte
+++ b/src/routes/checkout/OrderSection.svelte
@@ -4,76 +4,78 @@
   import { cart, subTotal } from '$lib/cartStore';
   import { decrementProductInCart, incrementProductInCart } from '$lib/websocketCart';
 
-  // $: totalPrice = $cart
-  //   .map((order: IOrderLineItem) => order?.price * order.quantity)
-  //   .reduce((a, b) => a + b);
   const shippingPrice = 75;
+  $: totalPrice = $subTotal + shippingPrice;
+
+  function lineItemClass(id: number) {
+    return `lineitem-${id}`;
+  }
 </script>
 
-<table class="checkout">
-  <thead>
-    <tr>
-      <th>Varenavn</th>
-      <th>Antall</th>
-      <th>Pris</th>
-    </tr>
-  </thead>
-
-  <tbody>
-    {#if $cart.length}
-      {#each $cart as cartItem}
-        <tr>
-          <td>
-            <div class="line-order">
-              <a href="/shop/{cartItem.product_no}"><span>{cartItem.name}</span></a>
-              <span class="subtext">Størrelse: {cartItem.size}</span>
-            </div>
-          </td>
-          <td>
-            <QuantitySelect
-              bind:value="{cartItem.quantity}"
-              hideButtons="{true}"
-              on:decrement="{() => decrementProductInCart(cartItem.lineitem_id)}"
-              on:increment="{() => incrementProductInCart(cartItem.lineitem_id)}"
-            />
-          </td>
-          <td>Nok {cartItem.quantity * cartItem.price}</td>
-        </tr>
-      {/each}
-    {:else}
-      <tr class="no-products">
-        <td>(ingen produkter)</td>
-        <td>0</td>
-        <td>Nok 0</td>
+<div style="border: 2px solid black">
+  <table class="order-summary">
+    <thead style="border-bottom: 2px solid black;">
+      <tr>
+        <th>Varenavn</th>
+        <th>Antall</th>
+        <th>Pris</th>
       </tr>
-    {/if}
+    </thead>
 
-    <tr>
-      <td>Totalpris:</td>
-      <td></td>
-      <td>Nok {$subTotal}</td>
-    </tr>
+    <tbody>
+      {#if $cart.length}
+        {#each $cart as cartItem}
+          <tr id="{lineItemClass(cartItem.lineitem_id)}">
+            <td>
+              <div class="line-order">
+                <a href="/shop/{cartItem.product_no}"><span>{cartItem.name}</span></a>
+                <span class="subtext">Størrelse: {cartItem.size}</span>
+              </div>
+            </td>
+            <td>
+              <QuantitySelect
+                bind:value="{cartItem.quantity}"
+                hideButtons="{true}"
+                on:decrement="{() => decrementProductInCart(cartItem.lineitem_id)}"
+                on:increment="{() => incrementProductInCart(cartItem.lineitem_id)}"
+              />
+            </td>
+            <td>Nok {cartItem.quantity * cartItem.price}</td>
+          </tr>
+        {/each}
+      {:else}
+        <tr class="no-products">
+          <td>(ingen produkter)</td>
+          <td>0</td>
+          <td>Nok 0</td>
+        </tr>
+      {/if}
 
-    <tr>
-      <td>Frakt:</td>
-      <td></td>
-      <td>Nok {shippingPrice}</td>
-    </tr>
+      <tr style="border-bottom-color: rgba(0,0,0,0.15)">
+        <td>Totalsum:</td>
+        <td></td>
+        <td>Nok {$subTotal}</td>
+      </tr>
 
-    <tr style="font-weight: 600">
-      <td>Totalsum:</td>
-      <td></td>
-      <td>Nok {$subTotal}</td>
-    </tr>
-  </tbody>
-</table>
+      <tr style="border-bottom-color: rgba(0,0,0,0.15)">
+        <td>Frakt:</td>
+        <td></td>
+        <td>Nok {shippingPrice}</td>
+      </tr>
+
+      <tr style="font-weight: 600">
+        <td>Pris:</td>
+        <td></td>
+        <td>Nok {totalPrice}</td>
+      </tr>
+    </tbody>
+  </table>
+</div>
 
 <!-- <slot name="express-checkout-buttons" /> -->
-
 <style lang="scss" module="scoped">
-  table.checkout {
+  table.order-summary {
     width: 100%;
-    border: 2px solid #dbd9d5;
     border-collapse: collapse;
 
     thead {
@@ -101,8 +103,11 @@
       color: rgba(0, 0, 0, 0.5);
     }
 
+    tr:not(:last-of-type) {
+      border-bottom: 2px solid black;
+    }
+
     td {
-      border: 2px solid #dbd9d5;
       padding: 1rem 0.5rem;
       min-width: 50px;
       font-size: 1.1rem;
diff --git a/src/routes/checkout/validation.ts b/src/routes/checkout/validation.ts
new file mode 100644
index 0000000..6a03f69
--- /dev/null
+++ b/src/routes/checkout/validation.ts
@@ -0,0 +1,27 @@
+let badElements: HTMLElement[] = [];
+
+interface IOrderValidationError {
+  type: string;
+  field: number | string;
+  message: string;
+}
+
+export function removeBadElements() {
+  badElements.forEach((element) => element.classList.remove('bad-form'));
+  badElements.forEach((element) => {
+    const msgErrorElement = element?.getElementsByClassName('bad-msg');
+    if (!msgErrorElement || msgErrorElement?.length === 0) return;
+    msgErrorElement[0].remove();
+  });
+  badElements = [];
+}
+
+export function addBadElement(element: HTMLElement, vError: IOrderValidationError) {
+  element.classList.add('bad-form');
+  badElements.push(element);
+
+  const msgElement = document.createElement('div');
+  msgElement.classList.add('bad-msg');
+  msgElement.innerText = vError.message;
+  element.appendChild(msgElement);
+}