Add ordercloud provider (#500)

* Add ordercloud provider

* Fix provider errors

* Make submit checkout optional

* Make submit checkout optional

* Remove nullables when creating endpoint type

* Update readme

* Log checkout error

* Log error

* Save token to cookie

* Update fetch rest

* Use token at checkout

Co-authored-by: Luis Alvarez <luis@vercel.com>

framework/ordercloud/api/endpoints/cart/get-cart.ts

@@ -0,0 +1,65 @@
+import type { OrdercloudLineItem } from '../../../types/cart'
+import type { CartEndpoint } from '.'
+
+import { serialize } from 'cookie'
+
+import { formatCart } from '../../utils/cart'
+
+// Return current cart info
+const getCart: CartEndpoint['handlers']['getCart'] = async ({
+  req,
+  res,
+  body: { cartId },
+  config: { restBuyerFetch, cartCookie, tokenCookie },
+}) => {
+  if (!cartId) {
+    return res.status(400).json({
+      data: null,
+      errors: [{ message: 'Invalid request' }],
+    })
+  }
+
+  try {
+    // Get token from cookies
+    const token = req.cookies[tokenCookie]
+
+    // Get cart
+    const cart = await restBuyerFetch(
+      'GET',
+      `/orders/Outgoing/${cartId}`,
+      null,
+      { token }
+    )
+
+    // Get line items
+    const lineItems = await restBuyerFetch(
+      'GET',
+      `/orders/Outgoing/${cartId}/lineitems`,
+      null,
+      { token }
+    ).then((response: { Items: OrdercloudLineItem[] }) => response.Items)
+
+    // Format cart
+    const formattedCart = formatCart(cart, lineItems)
+
+    // Return cart and errors
+    res.status(200).json({ data: formattedCart, errors: [] })
+  } catch (error) {
+    // Reset cart and token cookie
+    res.setHeader('Set-Cookie', [
+      serialize(cartCookie, cartId, {
+        maxAge: -1,
+        path: '/',
+      }),
+      serialize(tokenCookie, cartId, {
+        maxAge: -1,
+        path: '/',
+      }),
+    ])
+
+    // Return empty cart
+    res.status(200).json({ data: null, errors: [] })
+  }
+}
+
+export default getCart