Developing a Buy Now, Pay Later (BNPL) app like Zebit involves several key features and costs. Essential features include user registration and authentication, a secure payment gateway, purchase tracking, credit assessment, transaction history, notifications, and customer support. Advanced features might include personalized offers, integration with various e-commerce platforms, fraud detection, and detailed analytics. The development cost can range from $50,000 to $150,000 or more, depending on the complexity of the features, the platform (iOS, Android, or both), design requirements, and the location and expertise of the development team. Regular maintenance and updates will also be necessary to ensure security and user satisfaction.