This is a simple workflow to get an SMS notification when a new customer signs up for your service. We will be using Zapier and Stripe in this example, but you could use PayPal/Braintree instead of/as well as Stripe.
Set up a Zap with the trigger app Stripe.
Select the trigger to when you get a new charge when a credit card is charged. You can select other options too.
Connect the Stripe account
Here I've chosen not to include failed charge.
Run the tests.
Now select the SMS Action app
Connect an account with your phone number to receive the SMS alerts.
Add a message with custom text that you want to show up.
You could bring in customers information like the following
Test it and you're good to go!