Let users log in to your WordPress site using WhatsApp messages instead of SMS. No more blocked numbers — thanks to reverse OTP verification!

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<p><strong>Login with WhatsApp (Reverse OTP)</strong> allows users to authenticate by sending a message via WhatsApp to the admin number instead of receiving a code. This unique method, called <em>Reverse OTP</em>, ensures that the <strong>user is the initiator</strong> of the conversation, drastically reducing the chances of the admin number being blocked by WhatsApp.</p>
<p>This plugin is ideal for login, membership, or community-based WordPress websites where mobile-based verification is preferred over email/password.</p>
<h3>Third-party Service</h3>
<p>This plugin requires a third-party service to function properly. It integrates with the external <strong><a href="https://whatsiplus.com" rel="nofollow ugc">Whatsiplus API</a></strong> in order to provide OTP-based login functionality via WhatsApp.</p>
<p>The plugin communicates with the following endpoints from the service:</p>
<ul>
<li><strong>API Base URL:</strong> https://api.whatsiplus.com  </li>
<li><strong>Send Message:</strong> https://api.whatsiplus.com/sendMsg  </li>
<li><strong>Receive Message:</strong> https://api.whatsiplus.com/receivedMessages  </li>
<li><strong>Service Settings:</strong> https://api.whatsiplus.com/serviceSettings  </li>
</ul>
<h4>What data is sent and when:</h4>
<ul>
<li><strong>During login or OTP request:</strong> The plugin sends the user’s phone number (as entered by the user) and your API key to the Whatsiplus service in order to initiate OTP verification.</li>
<li><strong>During plugin configuration:</strong> The plugin sends your API key to verify service status and fetch related settings (such as connected number and country code).</li>
</ul>
<p>No other personal data is transmitted to Whatsiplus.</p>
<h4>Requirements:</h4>
<p>This plugin <strong>will not work</strong> without a valid Whatsiplus API key. You can obtain a key by registering at <a href="https://whatsiplus.com" rel="nofollow ugc">https://whatsiplus.com</a>.</p>
<h4>Service provider details:</h4>
<ul>
<li><strong>API Service Provider:</strong> Whatsiplus.com  </li>
<li><strong>Documentation:</strong> https://docs.whatsiplus.com  </li>
<li><strong>Terms of Service:</strong> https://whatsiplus.com/terms-and-conditions/  </li>
<li><strong>Privacy Policy:</strong> https://whatsiplus.com/privacy-policy/</li>
</ul>
<h3>How it Works</h3>
<ol>
<li>User enters their phone number in the login form.</li>
<li>The system generates a unique OTP.</li>
<li>The user is instructed to send that OTP to the admin’s WhatsApp number.</li>
<li>Once received and verified, the user is logged in securely.</li>
</ol>
<h3>Key Features</h3>
<ul>
<li>✅ Let users log in without a password — via WhatsApp.</li>
<li>🔒 Reverse OTP system — <strong>prevents your WhatsApp number from being blocked</strong>.</li>
<li>🔎 Automatically detects OTP sent by users to Whatsiplus.</li>
<li>📸 Users can scan a <strong>QR Code</strong> to quickly open WhatsApp with their unique code.</li>
<li>🔗 One-click <strong>direct WhatsApp link</strong> — no need to type the code manually.</li>
<li>💬 Sends welcome messages after login.</li>
<li>📱 WooCommerce compatible (but not required).</li>
<li>📊 Built-in log system to track login attempts.</li>
<li>🔧 Admin can choose which user meta field contains the phone number.</li>
<li>🌍 Default country code support.</li>
<li>🌐 REST API endpoints to support external apps (mobile, PWA).</li>
<li>🧩 Includes Widget and Shortcode for login anywhere on your site.</li>
<li>🛠️ Supports custom user fields (e.g. contact_number, mobile, billing_phone, etc.)</li>
</ul>
<h3>REST API</h3>
<p>Two REST endpoints are available for developers:</p>
<ol>
<li><code>POST /wp-json/reverse-otp/v1/request</code>
<ul>
<li>Input: <code>{ "phone": "1530xxxxxxx" }</code></li>
<li>Output: <code>OTP code + WhatsApp link + expires_in</code></li>
</ul>
</li>
<li><code>POST /wp-json/reverse-otp/v1/verify</code>
<ul>
<li>Input: <code>{ "phone": "...", "code": "..." }</code></li>
<li>Output: Auth status (if successful, user will be logged in)</li>
</ul>
</li>
</ol>


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