Thanks for asking!
The first thing that you need to test Address Validation - US (or any of our other data validation products) is a valid trial or production key for the product. Trial keys are free, valid for 30 days and come with 500 transactions to test with. No credit card is required to sign up for a key.
To get your key, fill out the form on the Address Validation - US product page and one will be emailed to you.
Once you have your key, you are ready to start testing our service. This short video walks you through the 3 easy steps to integrating our Address Validation - US API.