For SMS marketing we use Postscript:
If you already have a Postscript account, just let us know as we have to reach out to their customer support to manually get access to the account.
If you do not have Postscript set up for your brand yet, click HERE and sign up for a new account. Please make sure you have the app installed on Shopify, billing set up, and a credit card on file. When you finish setting up your Postscript account, just let us know.
Click continue when you finish this task