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/checkout/submit-checkout.ts

@@ -0,0 +1,32 @@
+import type { CheckoutEndpoint } from '.'
+
+const submitCheckout: CheckoutEndpoint['handlers']['submitCheckout'] = async ({
+  req,
+  res,
+  body: { cartId },
+  config: { restBuyerFetch, tokenCookie },
+}) => {
+  // Return an error if no item is present
+  if (!cartId) {
+    return res.status(400).json({
+      data: null,
+      errors: [{ message: 'Missing item' }],
+    })
+  }
+
+  // Get token from cookies
+  const token = req.cookies[tokenCookie]
+
+  // Submit order
+  await restBuyerFetch(
+    'POST',
+    `/orders/Outgoing/${cartId}/submit`,
+    {},
+    { token }
+  )
+
+  // Return cart and errors
+  res.status(200).json({ data: null, errors: [] })
+}
+
+export default submitCheckout