Log in to your SMSGatewayCenter panel, go to Integrations → Contact Form Integration, and configure your SMS/WhatsApp settings. Click Generate Code to copy the iframe snippet. Paste it into your website’s contact page HTML (e.g., in a <div>). Ensure your site allows iframes by removing X-Frame-Options: DENY or setting Content-Security-Policy: frame-ancestors ‘self’ https://unify.smsgateway.center;. Whitelist your domain in the panel for security.
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