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Prerequisites

Setup

1

Create a Telnyx API key

In Telnyx, open API keys and create a key.
2

Configure in Courier

Open the in Courier, enter your API key and originating phone number, then click “Save.”
Addressing a recipient and sending are the same on every SMS provider, so they are documented once: and .

Overrides

covers the two levels and which one wins. Overrides change the request body Courier sends to Telnyx. You can override any field the outgoing call supports:
Override fields are merged at the top level of the request, so each key you set replaces that key outright rather than merging into it. override.headers and override.config.url are honored too. The full field list is in the Telnyx Messaging API docs.

Provider details

Courier recommends routing to the channel. Naming this key in routing.channels instead is supported, and sends through just this provider.

Send to a specific provider

When that is worth doing, and what you give up: failover, channel priority, and providers you add later.