Description
This plugin is an add-on for the Booking Calendar plugin and requires it to function (version 10.10.2 or newer).
It enhances booking security by introducing One-Time Password (OTP) verification via SMS or email. When a user attempts to confirm a booking, they are prompted to verify the action with an OTP, helping to ensure the authenticity of the request.
SMS verification is provided via the SMS.to service. You must have an active SMS.to account and API key configured in the plugin settings to enable SMS delivery.
External Services
This plugin connects to an external service to send One-Time Passwords (OTP) via SMS as part of the booking verification process.
Service Used: SMS.to
What it’s used for: Sending OTPs (One-Time Passwords) via SMS during booking confirmations.
What data is sent and when:
– The recipient’s phone number
– The OTP message content
These are sent to the SMS.to API at the time a booking requires verification via SMS.
Terms of Service: https://sms.to/terms/
Privacy Policy: https://sms.to/privacy-policy/
Screenshots
OTP Settings panel in the WordPress dashboard. 
Booking page before sending the OTP. 
Booking page after verifying the OTP, with the Submit button enabled.
Installation
- Install and activate the Booking Calendar plugin (version 10.10.2 or newer).
- Upload the OTP Add-on plugin files to the
/wp-content/plugins/directory, or install the plugin through the WordPress plugin screen. - Activate the plugin through the ‘Plugins’ screen in WordPress.
- Go to Settings > OTP Settings to configure your SMS.to API key or email settings.
FAQ
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Does this plugin work with any version of Booking Calendar?
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No. This add-on requires Booking Calendar version 10.10.2 or newer.
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What is required to send SMS?
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You will need to sign up with SMS.to and enter your API key in the plugin settings to send OTPs via SMS.
Reviews
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Contributors & Developers
“OTP Add-on for Booking Calendar” is open source software. The following people have contributed to this plugin.
Contributors
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Interested in development?
Browse the code, check out the SVN repository, or subscribe to the development log by RSS.
Changelog
1.0
- Initial release.