A dedicated app/json area indicates REST-style JSON controllers for programmatic CRUD and queries—refer to upstream API documentation for authentication schemes and versioning.
OpenSearch, PowerDNS, and scanning hooks (file names) imply integration points for discovery and DNS alignment—not a unified event bus like Source A.
Source A exposes versioned REST, GraphQL, and webhooks as platform pillars. Source C targets pragmatic REST for scripting—adequate for many integrations without GraphQL breadth.