> For the complete documentation index, see [llms.txt](https://magecomp.gitbook.io/shopify/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://magecomp.gitbook.io/shopify/apps/fast-mobile-otp-login.md). # FAST Mobile OTP Login Allow your customers to log in to your store with a mobile OTP. Admins can also customize the message templates for creating more interactive message along with OTP usage transction tracking. The FAST Mobile OTP Login app provides an efficient way for customers to access your eCommerce store. By simply entering a one-time password (OTP) delivered to their registered mobile number, shoppers can securely log in. This feature offers enhanced security and authentication through the use of OTPs, which are sent directly to the user's mobile device. Furthermore, the app allows for customization of the OTP template and the appearance of the login widget to align with the overall theme of the store seamlessly. Moreover, the administrator can gain insights into OTP usage, including the total number of OTPs sent and the breakdown of verified and unverified OTPs. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://magecomp.gitbook.io/shopify/apps/fast-mobile-otp-login.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. 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.