One-Time Passwords are critical. Period.
We came up with a product called VeriSure to ensure delivery of OTPs and other critical notifications up to 100%.
How did we do it? We created fallback mechanisms on each channel. Such messages can be tried multiple times with a fallback in place: SMS --> Voice --> Email --> WhatsApp.
The best thing? Its all automated.
For upgraded account security, Twilio Authy and Twilio Verify make it simply to add user verification to any web-based application.
The codes can be sent via SMS, Voice, Email, Push to future proof your business.
Our Video/Voice APIs can be integrated on chatbots natively or sent directly as links via SMS, Email, etc.