The fifth step to create a consistent visual language is to review and refine your visual language. This means evaluating your FinTech interface against your visual identity, user needs, design principles, and contextual factors, as well as measuring its performance, usability, and user satisfaction. To do this, you should use various methods and tools such as heuristic evaluation, expert review, user testing, analytics, and A/B testing. Heuristic evaluation is a systematic inspection of your FinTech interface based on established usability criteria. Expert review is a feedback session with a design expert or FinTech specialist who can provide insights and suggestions on your visual language. User testing is a direct observation of how real users interact with your FinTech interface and how they react to your visual language. Analytics is a collection and analysis of quantitative data on how your FinTech interface is used and how it performs in terms of user behavior, engagement, and conversion. A/B testing is a comparison of two or more versions of your FinTech interface to determine which one performs better in terms of user response and outcome.