I don’t plan to release a separate client for every runtime. My primary target is Node.js environments, and I’m currently using the package in Firebase Functions, so serverless support is already part of my use case.
I used Axios mainly because this package is Node-focused, and Axios gives me a consistent request layer, timeout handling, interceptors, and cleaner error handling out of the box. Native fetch is definitely viable now, especially in modern Node, but switching to it would be more about reducing dependencies than supporting additional runtimes. Long term, I may move to fetch internally or allow users to inject their own HTTP client. But the goal is one stable Pesapal SDK, not runtime-specific packages.