OTP Service

OtpService.kt

class OtpService {
  // .. other methods for cache store etc. 
  
  fun generateAndSendOtp(number: String) {
    val otp = generateOtp(number)
    
    // save OTP to cache
    
    // send the OTP to number
    sendOtp(number, otp)
  }
  
  private fun generateOtp(number: String): String {
    // .. 
  }
  
  private fun sendOtp(number: String, otp: String) {
    // .. sending the SMS/EMail 
  }
  
  fun verifyOtp(number: String, otp: String): Boolean {
    // verification with the cache 
  }
}