Allow Each Customer to Buy a Product Only Once
Stops logged-in customers from buying the same product twice, for example a course, a membership or a limited item, and tells them they already own it.
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Allow Only Images and PDFs for Non-Administrators
Limits the file types authors, editors and other non-admin users can upload to common images and PDF documents.
Allow Only One Download in the EDD Cart
Empties the Easy Digital Downloads cart before a new item is added, so each purchase contains a single download, which suits licence or membership sales.
Allow Only Safe File Types to Be Uploaded
Limits uploads to common images, documents, audio and video, and rejects files with a hidden second extension such as photo.php.jpg.
Allowed Blocks per Post Type
Limits the blocks that can be inserted for specific post types, so structured content such as testimonials or team members only uses the blocks that fit.
Bricks Query Loop: Upcoming Items by a Date Field
Limits the chosen Bricks query loops to items whose date field is today or later and sorts them soonest first, for event and webinar lists.
BuddyPress: Only Friends Can Send Private Messages
Limits BuddyPress private messages so members can only message people who have accepted their friend request, which cuts down unwanted messages.
Cap the Commission Per Referral (AffiliateWP)
Limits how much commission any single referral can earn, so a very large order does not produce an outsized payout.
Cap the Quantity Selector
Limits the quantity field on product and cart pages to a maximum of 10 per product.
Change the Number of URLs per Sitemap Page
Changes how many links each page of the built-in XML sitemap holds (2,000 by default), for example to split a huge sitemap into smaller files.
Close Comments After a Set Number
Closes the comment form on a post once it has reached the number of approved comments you choose, keeping threads manageable.
Close a Contact Form 7 Form After a Number of Entries
Accepts only a set number of successful submissions for a Contact Form 7 form, such as event places or giveaway entries, then shows a "closed" message instead of the form.
Comfortable Line Length for Reading
Limits paragraphs, lists and quotes in posts to about 75 characters per line, the width recommended for readability, while wide blocks such as images and tables keep the full width.
Coupon Codes for First Orders Only
Limits chosen coupon codes, such as a welcome discount, to customers who have never placed a paid order, checked by account and billing email.
Customize Jetpack Related Posts
Changes the heading, number of posts and thumbnail visibility of Jetpack's Related Posts, and limits suggestions to posts from the last two years.
Default Upload Limits for Contact Form 7 File Fields
Gives every Contact Form 7 file field a safe default list of allowed file types and a maximum size, unless the field already sets its own.
Default Upload Limits for Gravity Forms File Fields
Gives every Gravity Forms file upload field a safe list of allowed file types and a maximum file size when the field does not set its own.
Default Upload Limits for WPForms File Fields
Gives every WPForms file upload field a safe list of allowed file types and a maximum size when the field does not set its own.
Disable a Payment Method Above an Order Total
Hides a payment method such as cash on delivery or bank transfer when the order total goes above a limit you choose.
Donor Comment Length Limit for GiveWP
Limits the optional donor comment on GiveWP forms to a sensible length and strips links from it, so donor walls do not fill up with spam.
Even Font Sizes in the Tag Cloud
Limits the tag cloud to 30 tags with font sizes between 12 and 18 pixels, so it looks tidy in narrow sidebars.
Free Article Limit for Visitors (Metered Paywall)
Lets visitors read a few posts each month for free, then asks them to log in or sign up to keep reading; members always read without limits.
Limit How Many Files Non-Administrators Can Upload per Hour
Caps uploads at 30 files per hour for each user who is not an administrator, which limits the damage a compromised author account or a buggy front-end upload form can do.
Limit How Many Sites Each User Can Create
Stops a user from signing up for another site once they already own the number you set; super admins are never limited.