BSG utilizes HTTP cookies (and similar or complementary technologies) to 1) make this website safe, functional, and accessible (through the use of mandatory cookies) and 2) understand how you use our website (through the use of optional cookies) in order to improve your experience and to provide you with personalized content.

The information in the cookie text files may be related to your personal preferences or your device and is intended to make the site operate according to your expectations. The information contained in cookies does not usually identify your identity directly but is helpful in providing you with a more personalized user experience.

In accordance with the requirements of the General Data Protection Regulation (GDPR) privacy and security law that governs how the personal data of individuals in the EU may be processed and transferred, we provide you the possibility to prohibit the use of certain types of cookies when you use our website.

Read our Cookie Notice and the Privacy Policy for detailed information on how BGS collects and uses cookies. Please note that prohibiting the use of certain types of cookies may affect your interaction with the website and limit the accessibility of services we offer you. Choose the appropriate category below to learn more and to disable cookies.

Accept All cookies*

*Recommended for comfortable use of the site

Accept only necessary cookies

Accept only selected cookies

Necessary cookies

Social media

Analytics

Marketing

One-Time Password (OTP)

What is One-Time Password (OTP)?

A one-time password (OTP) is a randomly generated code valid for a single authentication session or transaction, used as a second factor to verify a user’s identity.

A one-time password (OTP) is a single-use verification code — typically 4 to 8 digits — generated by a server and delivered to a user through SMS, email, WhatsApp, Telegram, or voice call. The code expires after a short window, usually 60 to 120 seconds, and cannot be reused. OTPs serve as the second factor in two-factor authentication (2FA), adding a possession-based check (the user’s phone) to a knowledge-based check (the user’s password). Businesses use OTPs for login verification, transaction confirmation, password resets, and account registration. The delivery channel matters: SMS OTP reaches any phone without internet, while app-based OTP (Telegram, WhatsApp) requires the user to have the app installed. Production OTP systems typically use cascade routing — trying the cheapest channel first and falling back to SMS if delivery is not confirmed — to balance cost and reliability. BSG’s 2FA solution supports OTP delivery across SMS, Telegram, WhatsApp, and voice with automatic failover.