> For the complete documentation index, see [llms.txt](https://developers.esms.vn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.esms.vn/en/readme/gioi-thieu-he-thong-api.md).

# Getting started

* If your website or system requires the capability to send messages via SMS/Zalo/Viber for scenarios like confirming registration codes on the website or notifying staff of meetings and birthdays, then we can help you get started.
* The eSMS API system is designed to meet your needs, ensuring fast, simple, and seamless integration with any system while providing a reliable and trusted solution relevant to many languages such as C#, Java, and PHP.