as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
make a list of the components of an e-wallet.
user
a typical e-wallet includes:
- payment processing system 
- security mechanism to protect accounts and transactions
- user interface to track payments and budget
- database to keep track of account and transaction history
- reward system to encourage users to use the e-wallet
assistant