插件标签： serial number
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Serial Number for Contact Form 7
Add-on for Contact Form 7 plugin. Add your own mail-tag to display the serial number.
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WC Serial Numbers – Ultimate License Manager for Selling, Licensing & Securely Delivering Digital Content with WooCommerce
The easiest way to sell digital products and manage licenses with WooCommerce.
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Contact Form Counter
A discrete plugin to add counter/time/timestamp to mails received with shortcodes that can be added anywhere on your mail