Marketing and transactional Email API submissions
The Email API now distinguishes marketing from transactional submissions. The previous single submission type was replaced with dedicated marketing and transactional payloads, including variants that handle list management and that target a contact by ID. Webhook event types were also formalized for more predictable event handling.
Reorganized API reference
The API reference was organized into clearly tagged sections — Account, Billing, Campaign, Contact, Email API, Forms, and more — making endpoints easier to browse.
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