Builder resources
From the first token to production volume: the guides, references and practices that take an integration from “it sent something” to “it delivers, reliably, and we know why”.
Two documents cover the whole surface. Read the first, keep the second open.
Step by step from an empty account to a delivered message: domain authentication, tokens, first send and status webhooks.
ReferenceEvery public endpoint, with authentication, scopes, idempotency, error codes and webhook signature verification.
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The three integrations that cover most of what people actually ship.
One POST, in cURL, Node.js or Python, with the 202 response explained field by field.
How segments are counted, and why a single accented character can double the price of a message.
The event envelope, the signature scheme, and reference verification code you can paste in.
Inbox placement is earned before it is measured. These are the parts that decide it.
SPF, DKIM and DMARC explained in the order you should publish them, with the dedicated-subdomain rationale.
Ramping volume, what bounce and complaint rates actually mean, and why transactional and marketing stay apart.
The full event vocabulary, from accepted to complained, and what we suppress automatically on your behalf.
What keeps an integration correct once real traffic is flowing through it.
How to retry a write without sending twice or being charged twice — the header, and how to pick the key.
Scope table, the role intersection rule, and why the secret is shown exactly once.
Per-credential limits, the stable error codes to branch on, and what to do with a 429.
The commitments behind the product, in plain language.
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