Biometric systems are widely used today in different interesting applications. Even though the hotel industry has some instances of biometric room access systems, hotel payment confirmation has yet to be implemented. To find how such a biometric system should be designed, we theoretically analyze different models of biometric systems. Fingerprint systems used alone and with gender filtering, face recognition or an identification element are discussed. The architecture of a biometric system for transaction confirmation in hotels is then proposed based on the analytical findings. We have found that a fingerprint system with an identification element is the most appropriate for hotel payment confirmation. Based on the given results a general design of a device for wireless biometric transaction confirmation is also proposed.