The Telephone Consumer Protection Act, or TCPA, is a federal law aimed at protecting consumers from certain automated calls, text messages, and faxes. Ultimately, it prohibits making automated telephone calls or sending automated SMS messages without the prior express consent of the recipient. You can view the full TCPA rules here.
After installing LiveRecover on your store, it's very important to verify that the correct language is present in the phone field on your checkout page. The language in the phone field indicates that the customer who entered their phone number has opted-in to receive messages from your business.
For more information on how to ensure your Shopify store is compliant, check out this article.