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API guides, code examples, and technical references for building payment integrations.
Complete guide to IBAN validation in JavaScript: calling the ibanchecker.cash API with fetch, implementing MOD-97 with BigInt for offline use, browser form integration, and the ibantools npm package.
Read article →How to validate IBANs in Ruby using ibanizator and banktools-eu gems, a pure-Ruby MOD-97 implementation, Rails model validator, and calling the ibanchecker.cash REST API for bank metadata.
Read article →IBAN validation in Swift: full MOD-97 struct with chunked integer arithmetic, UITextField real-time feedback extension, async/await URLSession integration with the ibanchecker.cash API, and XCTest coverage.
Read article →Architecture guide for event-driven IBAN validation: webhook receiver implementation in Node.js, HMAC signature verification, idempotency, exponential backoff retry logic, bulk batching, and dead-letter queue handling.
Read article →Performance patterns for high-volume IBAN validation: local MOD-97 pre-filtering, micro-batching with the bulk API endpoint, two-layer LRU + Redis caching, concurrency limiting, and observability metrics.
Read article →Three production-ready Java approaches: the ibanchecker.cash REST API, Apache Commons Validator, and the iban4j library — with Spring Boot integration and JUnit 5 unit tests.
Read article →IbanNet NuGet package, a zero-dependency manual MOD-97 implementation, ASP.NET Core data annotation integration, and FluentValidation support — all with .NET 8 examples and xUnit tests.
Read article →Manual MOD-97 implementation with zero allocations, github.com/almerlucke/go-iban library, Gin middleware integration, and benchmarks — complete with Go unit tests and subtests.
Read article →Two approaches: call the ibanchecker.cash API for full bank data, or implement MOD-97 validation yourself. Includes working code for both.
Read article →Two production-ready approaches: call the ibanchecker.cash API for bank metadata, or implement the MOD-97 algorithm yourself. Includes working code and pytest examples.
Read article →Architect-level guide to IBAN API design — GET vs POST tradeoffs, error code standards, normalization contracts, KV caching strategy, rate limiting, and country-specific edge cases.
Read article →Country-specific regex patterns for DE, GB, FR, NL plus a generic IBAN regex — and why regex is only step 1 of validation, not the full solution.
Read article →Comparison of ibantools, python-stdnum, php-iban, and go-iban — features, MOD-97 support, BIC lookup, TypeScript support — plus when to use a library vs. a hosted API.
Read article →Three production-ready PHP approaches: a zero-dependency MOD-97 function, the globalcitizen/php-iban Composer package, and REST API integration with a Laravel validator rule.
Read article →Convert a French RIB (code banque, code guichet, account number) to a valid FR IBAN. Covers the Clé RIB formula, MOD-97 check digits, Python and TypeScript code, and common mistakes.
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