To sign up for a Fetch account, go to the Plugins page under Manage > External > Embeds, enter your desired username in the Fetch Handle field, and click "Create Fetch Account." You can also sign up straight from Fetch using referral code "goodsie." Then enter your Fetch Key, Fetch Token and username on the Plugins page.
Add digital products to your Fetch account and assign a SKU to each. On the Goodsie side, select Digital as the product Type and add the corresponding Fetch SKU to the Fetch SKU field. After an order for the item is complete, Fetch will automatically contact the customer with directions for downloading the file.