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Product API errors use this shape:
Treat the HTTP status as authoritative. Validation and permission errors need a change to the request or configuration. Retry transient failures with exponential backoff and jitter, preserving the same idempotency key for writes that support it. On a timeout, do not assume that a send failed. Rate limits and sending quotas are separate controls. A successful subscription does not remove operational or abuse limits. Inspect the response’s error message before retrying a quota rejection.

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Lists

Most list responses contain object: "list", has_more and data. Where supported, pass limit (1–100) and use the last returned ID as the next after cursor. Outbound email lists accept either after or before, never both. Inbox and received-email lists accept after only. Some lists are not paginated; check the endpoint’s query parameters instead of assuming cursors are supported everywhere.