DocB vs Paytools

DocB is a native documentation app built for developers who work with APIs. Bring the DocC sources you use into one focused library. Search across them instantly, save important pages for later, and keep reference material close wherever you work. Whether you are looking up an endpoint signature, scanning a framework guide, or researching away from your desk, DocB helps you stop bouncing between browser tabs and start getting answers faster. DocB supports Apple Developer Documentation, custom DocC sites, and popular documentation sources, so you can create a reference library that matches your workflow. Key features: - Read DocC documentation in a native app with fast, distraction-free browsing - Add popular documentation sources or your own DocC website - Search across all connected sources and DocC content - Save bookmarks and bookmark collections for quick follow-up - Sync sources and bookmarks with CloudKit - Continue reading across Mac, iPad, and Vision Pro

Paytools is an offline payment-engineering workbench for developers, QA engineers, integrators, students, and fintech teams. Decode and inspect common payment-message structures, explore field definitions, convert technical data, and keep essential payment references close at hand. Processing happens locally on your device, so pasted messages and imported files are not uploaded to a server. PAYMENT TOOLS • Inspect ISO 8583 MTIs, bitmaps, and present data elements • Decode and build primary and secondary bitmaps • Parse BER-TLV data and identify common EMV tags • Recognize SWIFT MT blocks and ISO 20022 XML messages • Convert between HEX, ASCII, decimal, binary, and packed BCD • Validate synthetic card numbers with the Luhn algorithm • Compose synthetic Track 2 and ISO-0 PIN-block test data • Use development utilities for XOR and DES odd parity KNOWLEDGE LIBRARY • Search all 128 ISO 8583 data elements • Learn ISO 8583:1987, 1993, and 2003 MTI concepts • Follow authorization from merchant to acquirer, scheme, and issuer • Understand STIP, advice, reversal, clearing, and settlement flows • Review ISO 20022 message families and validation concepts • Study EMV transaction and cryptogram terminology CODES AND FIELDS Search operational response-code references for common ISO profiles, Visa, Mastercard, UnionPay/UPI, 3-D Secure, and gateway HTTP outcomes. Open any ISO field for its purpose, format, and implementation notes, including an expanded guide to DE22 POS Entry Mode. PRIVATE BY DESIGN Paytools has no account requirement and no cloud processing. Use synthetic or appropriately masked test data. Production payment formats and code meanings can vary by network, region, product, and specification release. Paytools is an independent educational and development utility. It is not affiliated with or endorsed by any payment network. Formal certification and production processing require the current authorized specifications, test packs, approved cryptographic systems, and applicable security controls.