SDKs by language
One file, no dependencies, generated from the same specification that describes the API. It rejects fields that do not exist before the request leaves your process, which is where this API is at its most treacherous: it accepts a misspelled name, answers 201 and ignores it.
All ten, tested the same way
RokiConnect.phpTypeScriptNode 18+. roki-connect.tsPythonPython 3.8+. roki_connect.pyC# / .NET.NET 6 or later, no NuGet. 
RokiConnect.csAll ten come from the same openapi.yaml and pass the same 20 checks, actually executed against the sandbox before publishing: that they catch a made-up field before it reaches the network, that they demand the transaction_id where the UUID belongs, that they verify a webhook signature and reject one from seven minutes ago, that they create a real payment and read it back, and that they download a PDF without any text decoder touching a byte of it. Plus one no client can do on its own: all ten compute the same signature over the same body and download the same PDF byte for byte. A client that is wrong consistently with itself passes its own tests; what gives it away is not matching the other nine. If the API changes, all ten change.
Which ones have more road behind them
The 20 checks measure the same thing in all ten, but they are not the same age. PHP, TypeScript, Python and C# also ship inside the connectors installed in real stores, taking payments for months. Go, Java, Kotlin, Swift, Ruby and Dart are tested just as thoroughly and nobody runs them in production yet. This is not a warning about their quality - it is information we would rather hand you than have you find out.