Use WordPress internal cron system to hit external URLs on a scheduled basis.
More Plugins
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PDF 2 Post
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Photo Gallery by 10Web – Mobile-Friendly Image Gallery
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Kul Maintenance
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Public Post Preview
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Rel Nofollow Checkbox
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Categories Images
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Typewriter
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WP Custom Category Meta
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WP Easy Responsive Tabs
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WPS Bookings for WooCommerce
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Simple Vote – Share your Thought, By A Like/Dislike Vote!
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DK PDF – WordPress PDF Generator
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Clinked Client Portal
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Ultimate Responsive Image Slider
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Widgets Reloaded
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Site Health Tools
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Accordions
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Embed STL
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Meks Smart Author Widget
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Weaver Show Sliders