# double-opt-in/5.12.0/src/Subscription

Double Opt-In for Contact Form 7 – Secure, GDPR-Compliant Email Verification, version 5.12.0. 4 entries.

- Page: https://pluginprobe.com/plugins/double-opt-in/5.12.0/code/src/Subscription
- Release archive: https://downloads.wordpress.org/plugin/double-opt-in.5.12.0.zip

- file [NullSubscriptionGroupResolver.php](https://pluginprobe.com/plugins/double-opt-in/5.12.0/code/src/Subscription/NullSubscriptionGroupResolver.php)
- file [SubscriptionGroup.php](https://pluginprobe.com/plugins/double-opt-in/5.12.0/code/src/Subscription/SubscriptionGroup.php)
- file [SubscriptionGroupResolverInterface.php](https://pluginprobe.com/plugins/double-opt-in/5.12.0/code/src/Subscription/SubscriptionGroupResolverInterface.php)
- file [SubscriptionGroups.php](https://pluginprobe.com/plugins/double-opt-in/5.12.0/code/src/Subscription/SubscriptionGroups.php)

Append `?format=md` to any of these, or send `Accept: text/markdown`, to read them as
Markdown. Add `/raw/` in place of `/code/` for the file with no wrapper at all.