Retrofit describes the server API specification
Retrofit turns a Java or Kotlin interface into HTTP calls. Its method annotations define verbs and relative paths. Parameter annotations mark path values, query values, headers, bodies, forms and multipart parts. These declarations create a strong endpoint map even after class names have been shortened.
The interface is only the first layer. Retrofit uses a base URL, converter factories and call adapters. A converter controls the bytes sent for a model and the object created from a response. A call adapter controls whether the call returns a Retrofit call, coroutine result, reactive type or another wrapper.
The OkHttp layer changes every call
Retrofit sends requests through OkHttp. Application interceptors can add authentication, device headers, signatures and retries. Network interceptors can see redirects and the request that reaches the wire. An authenticator may refresh a token after a 401. Cookie storage, TLS settings and a custom request body can sit below the Retrofit interface.
We join the service declarations to the exact client instance that runs them. This prevents false endpoint lists built from unused interfaces or test code. Live requests confirm the active base URL, query encoding, body bytes, header order where relevant and response model.
The full APK becomes a full callable API
We rebuild the application’s complete server-facing behavior. The delivery includes Python, JavaScript and TypeScript clients, an importable Postman collection, and working request examples. Authentication, cookies, refresh rules, request order and error handling are built in.
Signature generation runs with fresh timestamps and nonces. Encryption and decryption are implemented in code. Binary bodies are serialized correctly. Each client can start a new session and repeat the application workflows without reusing an old capture.
We test the clients against the same server flows used by the APK. Send the APK on WhatsApp or by email. We handle the technical questions in the conversation.
Sources
Reviewed 30 August 2026 · SReverse research desk