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The PHP 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

PHP and Laravel use the same Composer package. Recipient fields are arrays, and the From domain must be verified in the same Signal project as the API key.

Laravel

Use the package’s Laravel service provider.

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