Instructions

1. Install dependencies npm install
2. Run express server: npm run dev
3. Run tests: npm run test
4. Run test coverage: npm run test-coverage

Approach

1. Using JSON schema validator to validate incoming requests. (eg: minLength of strings, amounts should be multiples of 0.01 and positive, etc...)
2. Customer info and balances are stored in memory.
3. Bank balances can only have 2 decimal places in amounts.
4. You cannot transfer funds to yourself.