Each key has its own security settings such as URL and IP restriction, and usage limits.  

Address Verification consists of two main API requests: a Find request is used to narrow down a possible list of addresses; and a Retrieve request is used to retrieve a fully formatted address. A typical address search is made up of a series of Find requests, followed by a Retrieve based on the user selection.  

Not that technical? Don’t worry, there's another, much easier way to implement address autocomplete using a tag or a native integration with existing eCommerce platforms, such as Magento or Shopify.