Auth0 Token Vault handles secure token storage, exchange, and refresh for external providers so you don't have to build it yourself.
Rolling your own OAuth token storage can be a security liability. Token Vault securely stores access and refresh tokens from federated providers and handles exchange and renewal automatically. Connected accounts, refresh exchange, and privileged worker flows included.
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Send Bulk OTP SMS in PHP using SMS Gateway Center HTTP API
You need to be registered member with https://www.smsgatewaycenter.com/ and then you can use this script to send OTP SMS to your clients and peers.
This script is just an example to send sms and validate OTP using session. But you can use it with your database to get users and send out OTP SMS to registered members and have them validated.
About SMSGatewayCenter.com SMS Gateway Center is one of the leading Bulk SMS Gateway...
Full featured HTTP SMS gateway for 2n VoiceBlue GSM VoIP adapters with sending / receivig capabilities, XML outputs, POST/GET controls and a basic WEB frontend.