# Sign In Users {% hint style="warning" %} **Security Recommendation:** We highly advise integrating a captcha, such as [HCaptcha](https://hCaptcha.com/?r=cd52ac96a013), to verify legitimate sign in actions when using your API key. Please be aware that not implementing this safeguard could result in the deactivation of your API key if we detect any unauthorized login attempts or abuse through your API key. {% endhint %} --- # 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://doc.yeerlo.com/documentations/yeerlo-api/calling-methods/onboarding-auth/sign-in-users.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.