QR · Barcode · Lookup workflows

Android QR and barcode API reconstruction

A scan is often the first step in a longer server workflow. We recover the decoder inputs, lookup calls, signatures, sessions and result handling as one callable API.

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Separate scanning from the server workflow

Android apps can scan with CameraX, Google Code Scanner, ML Kit or a bundled decoder. Google documents that ML Kit returns the raw value, display value, format and structured data for supported barcode types. The app then decides how to parse or route that value.

A QR code may contain a URL, account identifier, ticket, product code or signed payload. The app can transform it before the lookup: remove a prefix, decode Base64, select fields, add a checksum or join it with device and session data. We trace that path from scanner callback to network request.

Recover the complete lookup and verification flow

We map search, lookup, validation and follow-up calls together. A first request may exchange the scanned value for a short-lived token. A second can fetch details. A final call can confirm, redeem, track or submit the result. Every response field carried into the next request is recorded.

Camera input is removed from the delivered clients. Python and JavaScript accept the decoded text or an image when local decoding is useful. The Postman collection exposes each server step with working variables and scripts. Signatures, encryption, authentication and error responses are reproduced across the full APK.

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

One full APK. One complete delivery.

Projects start at $120. Most are delivered in 24 to 72 hours.

Every format included

Python, JavaScript/TypeScript, Postman and complete API documentation cover the same full endpoint set. Your team runs the clients in its own server or system.

Ready in 24–72 hours

The delivery window starts after we receive the APK and any account access needed to run it. The fixed quote states the deadline. Most projects finish sooner.

Deployment checked before the quote

The package includes signing, encryption, decryption and session handling. We verify device-bound keys and server integrity checks during review and document runtime requirements before you commit.

30 days of fixes

Report a defect within 30 days of delivery. We fix any delivered call that does not match the tested APK at no extra cost.