# 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="/files/1DPnBlNi312BBmrtxMvQ" 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="/files/NM4Ko4pggAJyUHEngYpf" alt=""><figcaption></figcaption></figure>

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

<figure><img src="/files/UJzt1E4tQS091JToCpw2" alt=""><figcaption></figcaption></figure>

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

<figure><img src="/files/gGU2TEY1OJf5mAhwZhgE" alt=""><figcaption></figcaption></figure>


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