Need an interface provider who provide functionality for sending OTP through SMS/Phone call/ Email

Question

I am looking for a 3rd Party interface/component which provide the functionality

1. generates OTP
2. send it via SMS/phone call or email (provide interface for this)
3. validate OTP

Thanks Arun

though we have API's at twilio for sending OTP though SMS and phone call, but I am looking for end to end provide which I can plugin into my page and rest will be done from that 3rd party interface.