Your active contact templates and their custom fields — the ids to use as keys in customFields, with type, whether required, and options for select fields. New contacts use the isDefault template unless you pass a channelId.

Security:

• The organisationId in the URL must match the organisation your JWT was issued for — requests for a different organisation fail with 401.
• Requires CRM_ADMIN, ACCOUNT_OWNER, or CRM_BOT role; other roles receive 403.