The supported shapes for Attachment IDs in the MessageTemplates API.

This union preserves the concrete, documented input or response variants represented by its member types. Follow the links in t/0 to construct or inspect a specific shape.

Manages reusable email and SMS templates for Chimes.

Templates separate reviewed message content from recipient data supplied at send time. Render a preview before publishing, and treat safety results as part of the template lifecycle rather than as proof that a downstream carrier accepted a message.