> 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-cash-on-delivery-verification-extension/sms-gateway-api-settings.md).

# SMS Gateway API Settings

To verify customer mobile numbers for using the COD payment method, we have integrated the extension with 3 different API Gateways to send OTP messages.

<figure><img src="https://807210804-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F8wMgNeFnYjVGQmgdxMv4%2Fuploads%2Fnnmd10UYCcFRZHv6Hteu%2Fimage.png?alt=media&amp;token=f1fa361f-26d7-4743-a310-2b318172bcee" alt=""><figcaption></figcaption></figure>

* **SMS Gateway:** You can select your preferred SMS Gateway from the dropdown option.
* **OTP String Type:** Select the string type you want to use, either Numeric or Alphanumeric.
* **OTP String Length:** Select your OTP String length between 1 to 10.

**Bulk SMS:** By selecting “Bulk SMS” as Gateway, you need to enter the following details to send OTP texts.

<figure><img src="https://807210804-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F8wMgNeFnYjVGQmgdxMv4%2Fuploads%2FXCmyMdRLygPU0oEH00P2%2Fimage.png?alt=media&amp;token=e0a2a4eb-1e58-4e8b-8b79-2016c3ce9fad" alt=""><figcaption></figcaption></figure>

**MSG91:** By selecting “MSG91” as Gateway, you need to enter the following details to send OTP texts.

<figure><img src="https://807210804-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F8wMgNeFnYjVGQmgdxMv4%2Fuploads%2F8B3qjMYd3zf0zpoi71MC%2Fimage.png?alt=media&amp;token=b9e87c8d-9b31-4398-b43f-671d1b0d4539" alt=""><figcaption></figcaption></figure>

**Twilio:** By selecting “Twilio” as Gateway, you need to enter the following details to send OTP texts.

<figure><img src="https://807210804-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F8wMgNeFnYjVGQmgdxMv4%2Fuploads%2FF1nSNYvW3WTLcTkiMAvL%2Fimage.png?alt=media&amp;token=846a39f0-d65e-4c1d-b8e7-e4bdc78ec9ff" alt=""><figcaption></figcaption></figure>