# Start using Verify ### Features **OTP Generation** * **Automatic Generation**: OTPs are generated automatically and are unique for each verification attempt. * **Custom Length**: Users can configure the length of the OTP (must be between 2 to 10 digits). #### OTP Delivery * **Delivery Methods**: OTPs can be sent to users via SMS or WhatsApp. * **SMS Delivery**: The OTP is sent to the user's registered mobile number. * **WhatsApp Delivery**: The OTP is sent to the user's registered WhatsApp number. * **Registered Sender ID for SMS**: To make use of the Verify OTP feature via SMS, the user must have a registered Sender ID. * **Registered Business Phone Number for WhatsApp**: To make use of the Verify OTP feature via WhatsApp, the user must have a business phone number and an authentication template registered with Meta. #### OTP Validation * **Validation Window**: Configurable time window during which the OTP is valid (e.g., 5 minutes). * **Retry Attempts**: Limit on the number of allowed retry attempts for entering the OTP. The Verify OTP feature enhances security by adding an extra layer of verification. By following the configuration and usage guidelines, users can effectively utilize OTP for secure authentication processes. Ensure that a registered Sender ID is in place for SMS delivery to maintain compliance and reliability. For a comprehensive understanding and to see the feature in action, test it from our dashboard and refer to the video demonstration provided. **OTP Verification via SMS** {% embed url="" %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://guides.d7networks.com/verify/start-using-verify.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.