If you are using the WOTIO Advanced plan, then any update to a customer’s record in Shopify will possibly trigger an invite to be sent to that customer, provided they don’t already have an account with your store.

If you are doing a bulk update of customer information (such as bulk tagging customers), and you don’t want them to receive an invite during this process, you will want to disable automatic invites until 30 minutes after you have completed that update of customer information.