There are several different methods that can be used to understand the reliability of online payment systems:License of the payment system: Payment systems typically have a license. This license indicates that the payment system is reliable. By checking the license of the payment system, you can understand whether the system is reliable or not.Terms of use of the payment system: By reading the terms of use of the payment system, you can examine the guarantees and security measures provided by the system. This can help you understand whether the system is reliable.Popularity of the use of the payment system: By investigating whether the payment system is widely used or not, you can understand the reliability of the system. Payment systems that are widely used are generally considered to be more reliable.Customer reviews of the payment system: By reviewing customer reviews of the payment system, you can understand what kind of service the system provides. Customer reviews provide an idea of the reliability of the payment system.Security measures of the payment system: By reviewing the security measures of the payment system, you can understand the reliability of the system. Payment systems typically have security measures and these measures indicate that the system is reliable.