docs(shiptheory): add tutorial

Author: ndvo

src/functions/shiptheory/README.md

@@ -2,21 +2,74 @@
 
 This integration allows you to create shipments in ShipTheory for Foxy.io transactions.
 
+It will create a new unlabelled shipment in ShipTheory for each Foxy Transaction.
+At this point, this webhook asumes there is one shipment per transaction,
+containing all items purchased.
+
+
 ## How to use it
 
+#### Overview
 - Deploy this repository to your Netlify account.
 - Set the environment variables
-- Grab the function URL
-- Configure your Foxy Store to use that URL
+- Configure your Foxy Store JSON Webhook
 
 You will also need to configure your SipTheory rules.
 
+### Deploy
+
+You can use the "Deploy to Netlify" button at https://github.com/Foxy/foxy-node-netlify-functions or clone this repository.
+
+If you cloned the repository, go to Netlify and click "New site from Git" and choose your repository.
+
+### Set the environment variables
+
+When the deploy is finished:
+- click the "Site settings" button;
+- on the sidebar, click "Build & Deploy"
+- Under "Environment", click "Edit variables"
+- Create a `FOXY_SHIPTHEORY_EMAIL` environment variable and set it to your ShipTheory email
+- Create a `FOXY_SHIPTHEORY_PASSWORD` environment variable and set it to you ShipTheory password
+- Create a `FOXY_WEBHOOK_ENCRYPTION_KEY` environment variable. Let's get it's value from Foxy.
+    - Go to your Foxy account, choose your store and click the "integrations" link.
+    - Check the 'JSON WEBHOOK' checkbox and **copy the value from "Encryption Key"**
+    - If you already have a `JSON WEBHOOK` in place, click the `Add one more URL` button. 
+    - This webhook is only using the 'Transaction Created' event. **You may uncheck the others**.
+    - Leave this page open, because we will come back to it.
+- Go back to your Netlify settings and paste the Encryption key in the `FOXY_WEBHOOK_ENCRYPTION_KEY` environment variable.
+- **Save the environment variables in Netlify**
+
+### Configure your Foxy Store Webhook
+
+If you haven't closed your Foxy JSON Webhook integration page, keep it open as it will be needed now.
+
+First, in your app in Netlify (the page you are already if you've just done the previous step), do the following:
+- Click on the "Functions" tab of you Netlify app, and then on the "shiptheory" function.
+- Copy the "Enpoint" value from there.
+- Now go over to your Foxy JSON Webhook integration page and paste it into the **URL** field in the Foxy JSON Webhook.
+- **Click `Update Webhooks`**.
+
+From this point on, new Shipments will be created in ShipTheory for each new Foxy transaction.
+
+## Configure your ShipTheory rules
+
+Please notice that you need to connect to a carrier in ShipTheory to be able to handle shipments.
+
+For testings purposes (or if this is enough for your use case) you can create an **"Address Only Labels"** carrier account.
+
+Within ShipTheory, the new shipments created can be found under the "All" tab.
+You can create rules to automate what should happen to each shipment.
+
 # Reference
 
 ### Environment variables
 
+This section lists all environment variables you can set to configure your webhook.
+
+If new features are added to the webhook you may find new configurations here.
+
 | Evironment variabel           |  Description                                             |
 | ----------------------------- |  ------------------------------------------------------- |
-| FOXY_WEBHOOK_ENCRYPTION_KEY   |  The encryption key used to validate Foxy Signature. You can get it in your Store Admin integration section|
-| FOXY_SHIPTHEORY_EMAIL         |  The email used to log in to ShipTheory.|
-| FOXY_SHIPTHEORY_PASSWORD      |  The password used to log in to ShipTheory.|
+| `FOXY_WEBHOOK_ENCRYPTION_KEY`   |  The encryption key used to validate Foxy Signature. You can get it in your Store Admin integration section|
+| `FOXY_SHIPTHEORY_EMAIL`         |  The email used to log in to ShipTheory.|
+| `FOXY_SHIPTHEORY_PASSWORD`      |  The password used to log in to ShipTheory.|