If you already have Zentail's Draft App - Log into the BigCommerce Developer Portal using your "Store Owner" credentials" and delete the Zentail draft app.
How to Install the Zentail app from the BigCommerce Marketplace
1. Go here: https://www.bigcommerce.com/apps/zentail/
2. Click GET IT NOW
3. Log into your BigCommerce store with your "Store Owner" credentials.
4. Click Confirm.
5. Once installed, you may be prompted to log into your Zentail account via the embedded view in BigCommerce. If you see a 500 error, please click on the Login header navigation option on the embedded Zentail webpage within your BigCommerce store and enter your login credentials.
Please let us know if you have any questions!
Note: the Store Code will fill in, but the Client ID and Client Secret are not necessary with the new app.
BigCommerce shares throttling limits among all the apps on your store. If at any point updates are not flowing between BigCommerce and Zentail it may be due to your API limits in BigCommerce.