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 generated request type keeps optional fields explicit. Add an
idempotency_key when a worker
may retry the same logical send.All SDKs
Compare every supported language and framework.
Manage emails
Follow message states and delivery timelines.