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This walks through the common path: add contacts to a list, create an SMS campaign against it, and start sending. Replace as_live_… with your key.
1

Add a contact to a list

Upsert contacts by phone. The list is created if it doesn’t exist; the response includes its list_id.
2

Find a sending number

List your numbers and grab an id to send from.
3

Create the campaign

Pass the list_id and a number_id. The campaign is built but not yet sending.
4

Start sending

Send a one-off SMS

Skip campaigns entirely for transactional messages:

Create a voice agent + voice campaign

Campaign create/start and message send require the platform’s send infrastructure to be online. Reads (contacts, numbers, agents, campaigns) work on their own.