Returns the catalog of available provider types with their display names, descriptions, and configuration schema fields (snake_case, with type and required). Providers with no configurable schema return only provider, name, and description.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Comma-separated provider keys to filter by (e.g. sendgrid,twilio).
Case-insensitive substring match against the provider display name.
Exact match (case-insensitive) against the provider channel taxonomy (e.g. email, sms, push).