Inboxes
GET /v0/emails/inboxes · POST /v0/emails/inboxes · GET|PATCH|DELETE /v0/emails/inboxes/:inbox_id
(project twins under /v0/projects/:project_id/emails/inboxes…).
Create
username is optional (random if omitted). domain must be a verified domain
you own (or a subdomain of one with subdomains enabled), else the default
domain. client_id makes creation idempotent.
Update
PATCH accepts display_name and/or metadata. Metadata merges:
included keys overwrite, null removes one key, null for the whole object
clears it. Empty {} is rejected; at least one field is required.