So, you want to ship domestically within Australia and don't yet have a Sendle account?
There's only a few things you'll need to do first.
First off, head to the Sendle signup form.
Fill in the basic information requested.
Once you are done, click Sign up and your account is created!
Once you have logged into your Sendle Account, be sure to fill in your pickup information, etc. and also go to the Pickup tab to authorize that you won't send Dangerous Goods through Sendle.
Now, click on the API tab and enter in how many parcels you expect to send per week:
Once you've agreed to the terms and conditions, click Claim access.
On the page that appears, copy/paste your API Key and Sendle ID and return to ShipStation.
Head to your Account Settings (the gear icon in the upper right).
Next, select Shipping and then Carriers & Fulfillment from the sidebar on the left.
On the page that appears, click +Add a Provider Account and Select Sendle from the list.
On the popup, enter your API Key and Sendle ID and an account nickname and click Connect. And that's it! You'll be able to ship with Sendle!