To send SMS marketing messages for ecommerce, you must be SMS-compliant.
1. Before you send an SMS (or WhatsApp, Facebook Business Messenger, or Google Business Message), your customer must opt in to receive these messages from you.
2. You must inform customers about how they can opt out of your messages.
3. You must inform customers about what kinds of messages to expect from you.
4. You must respect any opt out requests.
5. You cannot send retail SMS marketing messages between 9 p.m. and 8 a.m. in the recipient’s time zone.
In the United States, you must also be compliant with the Telephone Consumer Protection Act (TCPA) and the guidelines of the Cellular Telecommunications Industry Association (CTIA).