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The Ruby SDK provides a class-based client and uses https://api.signal.apollodeploy.com by default. Before you start, create an API key with Emails: Send permission and verify the From domain.
1

Install the SDK

2

Store your API key

Set SIGNAL_API_KEY in the server environment or secret manager.
3

Send an email

The Ruby transport returns the decoded response as a hash. Recipient fields are arrays, and the From domain must be verified in the same Signal project as the API key.

Rails

Use the Rails integration and initializer.

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