> For the complete documentation index, see [llms.txt](https://docs.magecomp.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.magecomp.com/magento-2-out-of-stock-notification-extension/sms-gateway-apis.md).

# SMS Gateway API's

The extension comes with 3 different build in API Gateways to send in stock notification.

<figure><img src="/files/7hZJjTyz84AGlvmAAs39" alt=""><figcaption></figcaption></figure>

* **Bulk SMS:** By making selections of “Bulk SMS” as Gateway you need to enter following details to send in stock notification SMS.

<figure><img src="/files/cGJE74xN8xnMcPF4J1IY" alt=""><figcaption></figcaption></figure>

* **MSG91:** By making selections of “MSG91”as Gateway you need to enter following details to send in stock notification SMS.

<figure><img src="/files/QI1shdghA3lbvJNlx9lh" alt=""><figcaption></figcaption></figure>

* **Twilio:** By making selections of “Twilio” as Gateway you need to enter following details to send in stock notification SMS.

<figure><img src="/files/dFI1nS0wIYuoX5vNrWNn" alt=""><figcaption></figcaption></figure>