1. Create an Integration
a. From your Magento 2 admin dashboard go to System -> Integrations.
b. Add a new integration and name it AfterShip (suggested choice). You need to input your password for verification too. Leave the other fields empty.
c. In the API tab, give permission to access attributes of Sales, Catalog, Customers, Reports, and Stores.
d. Save the Integration.
e. Click Activate on the integration just created.
f. Click Allow to approve the access
g. Copy the Access Token. This is the only information you will need. Click Done.
2. Find Store ID
a. From the Magento 2 admin dashboard, open Stores -> All Stores.
b. Click on the target Store View.
c. Then you can find the Store ID in the browser URL.
3. Head back to AfterShip Magento 2 Connector and fill in details
Lastly, go to your AfterShip apps section, click on the Magento 2 connector and fill in the details you just created. (Shortcut: https://secure.aftership.com/apps/magento-2)
Your Magento 2 store should now be connected to your AfterShip account.