Account Settings > API Keys define('TELNYX_API_KEY', 'KEY019FE81389D96963153D9BF3D28FCD01_35iatOgJ8v7P9fxhEvA1Gl'); // From portal.telnyx.com > Verify > your "LendInsta OTP" profile define('TELNYX_VERIFY_PROFILE_ID', '4900019f-e80d-2d57-9991-8105838e8ea7'); // --- Lead storage --- // Simplest option: append to a CSV file. Swap this out for a // database insert (MySQL/Postgres) once you're ready — the // save_lead() function in submit-lead.php is the only place // that needs to change. define('LEADS_CSV_PATH', __DIR__ . '/leads.csv'); // --- Session-based OTP tracking --- // We store the phone number that was verified in the PHP session, // so submit-lead.php can confirm THIS phone was actually OTP-verified // before accepting the lead (prevents someone from skipping the OTP // step entirely by calling submit-lead.php directly). session_start();