You can invoke the AppSheet API from a webhook. This allows you to:
Add one or more records to a table.
Delete one or more records from a table.
Update one or more records in a table.
Perform an Action on one or more records in a table.
Invoking the AppSheet API
Go to the Behavior > Workflow or Behavior > Report tab.
Click Add New Workflow Rule
In Reaction select Webhook
In Preset select one of the following AppSheet action values:
In App Id select the target application name.
In Table select the target table name.
After the Save completes, click the Create button following Body Template.
The system will create a default Body Template to invoke the AppSheet API for the table you specified.
Customize the Body Template as described here.