This Plugin automatically adds 5 Digit Unique IDs to Permalinks ready for use with Google News.
Plugin Tag: unique id
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Date Filters, Date Picker & Unique IDs for Gravity Forms – Hero Add-On
Disable weekends, past dates and holidays in the Gravity Forms date picker, add date filters and unique IDs – without writing code.
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UniqueID for Contact Form 7
An add-on for Contact Form 7 to add an unique id to every form submission.