In order to keep smoothly marking orders as shipped on Shopify, you will need to give Zentail an additional scope before January 1st. This should only take 5 minutes!
Step 1. Login to your Shopify storefront.
Step 2. Navigate to your Settings page on the lower left sidebar.
3. Once on your Settings page, select "Apps and sales channels" on the left hand sidebar then click on "Develop apps".
4. On the App development page click the "Zentail" custom app.
5. Select "Configuration" and then click on "Edit" for the Admin API integration
6. In the "All" tab search "merchant-" and you will see "Merchant-managed fulfillment orders". Make sure that both the "read" and "write" scopes are selected. Don't forget to click save!
7. You're done!