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Implementation guides for email APIs, application sends, webhooks, and integration patterns, with examples and operational checks for developers.
A tested Python example that verifies a PulsePigeon signed status event, stores a receipt once, rejects a reused event ID with different content, and keeps send idempotency separate from event idempotency.
Wire a PulsePigeon send into a Node.js HTTP handler or a BullMQ worker. Idempotency keys, error handling, and a typed error model.
The Python SDK pattern: synchronous and asynchronous clients, deterministic idempotency keys, status-specific errors, and application-owned retries.
Conceptual guidance for server-side sends from FastAPI, including idempotency, response handling, and when a durable worker is safer than BackgroundTasks.
A server-only Next.js REST example for order receipts, with stable idempotency, accepted message IDs, error handling, and delivery-event follow-up.
How to use idempotency keys when sending transactional email so retries after a timeout never result in a duplicate message reaching a customer.