# Draft creation: POST /users/{id}/messages (Content-Type: text/plain, body = base64 MIME) # Send draft: POST /users/{id}/messages/{id}/send (no body) # Permissions ...

Give it an OpenAPI spec (v2 or v3), a GraphQL endpoint, a raw URL, or a manually defined endpoint — api-invoke parses it into a uniform interface, handles authentication, builds requests, classifies ...