Sample code
Sample code — send WhatsApp and email in five languages
Copy-paste examples for the calls you will actually make first: template send, Flow attach, OTP with fallback, transactional email and webhook verification.
Snippets by task
Send a template
cURL, Node, Python, PHP, Java, Go — with variable mapping and idempotency key.
Verify a webhook
HMAC verification with constant-time comparison in each language, plus a replay-window check.
OTP with SMS fallback
The full state machine: send, wait, check delivery event, fall back, expire.
Bulk broadcast
Chunked sends with backoff on 429 and per-chunk reporting.
Transactional email
Templated send with strict variable validation and bounce handling.
Catalog sync
Feed upsert with diffing so you only push changed SKUs.
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