Heysender provides official API SDKs for five languages, all maintained by Arnsbo Group on GitHub. Each SDK is open source under the MIT license and follows the same general structure: a src (or lib) directory with the core library, an examples folder with usage samples, and a README pointing to the central API documentation at documentation.heysender.com.
All SDKs are currently in early/active development (pre-1.0). The READMEs note that full descriptions are forthcoming, so the GitHub source and the API documentation are the primary references for now.
PHP
Repository: https://github.com/arnsbogroup/HS-php-sdk
Package name: heysender/heysender-api-sdk
Version: 0.9.0
Requirements: PHP ≥ 8.1, ext-curl, ext-json
Installed via Composer. The library lives under the Heysender\ PSR-4 namespace in src/. Usage examples are in the examples/ folder.
composer require heysender/heysender-api-sdk
Python
Repository: https://github.com/arnsbogroup/HS-python-sdk
Language: Python 100%
The library source is in src/heysender/ and usage examples are in examples/. No PyPI package name was visible in the repository at the time of writing — check the repo for the latest installation instructions.
Ruby
Repository: https://github.com/arnsbogroup/HS-ruby-sdk
Language: Ruby 100%
The library source is in lib/heysender/ and usage examples are in examples/. Check the repository for Gem name and installation details.
C#
Repository: https://github.com/arnsbogroup/HS-csharp-sdk
Language: C# 100%
Namespace: Heysender.SDK
The library source is in src/Heysender.SDK/ and tests are in test/. Check the repository for NuGet package details and installation instructions.
Go
Repository: https://github.com/arnsbogroup/HS-go-sdk
Module: heysender
Go version: 1.25.5+
The Go SDK is structured differently from the others — source files (client.go, types.go, enums.go, errors.go, message_builder.go) sit directly in the root of the repository alongside examples/. Import using the module path from go.mod.
go get github.com/arnsbogroup/HS-go-sdk
Resources
| Resource | Link |
|---|---|
| API documentation | https://documentation.heysender.com/ |
| GitHub organisation | https://github.com/arnsbogroup |
| PHP SDK | https://github.com/arnsbogroup/HS-php-sdk |
| Python SDK | https://github.com/arnsbogroup/HS-python-sdk |
| Ruby SDK | https://github.com/arnsbogroup/HS-ruby-sdk |
| C# SDK | https://github.com/arnsbogroup/HS-csharp-sdk |
| Go SDK | https://github.com/arnsbogroup/HS-go-sdk |