all together

PayrollService.kt

    fun generatePayrollFor(employeeName: String): Either<Problem, Payroll> {
        return employeeService.findEmployeeByName(employeeName)
            .flatMap { it?.let { buildPayrollForEmployee(it) } ?: UserDoesNotExistProblem(employeeName).left() }
            .tapLeft {
                logger.info("Could not fetch employee: ${it.message()}")
            }
    }