1. Make a key
In the app, open Developer → API keys → Create key. Give it a name, pick Send only, and copy the key. You see it only once.2. Check the key
3. Send an approved template
Use a template that is Approved in the app. Every template in the app has an API example card with this request filled in for you.id and its price. Requests sent here are real and charged like any other.
4. Follow the message
Ask for it withGET /v1/messages/{id}, or better, add a webhook and get message.delivered and message.read as they happen.