Hello,
My name is Sergey. I am Freelancer from Saint Petersburg, Russia.
I can help you as a WordPress programmer to create function and run it on schedule (daily) at 8 PM.
My scheduled function will change links to the 3 pdfs that are on the post change to another 3 pdfs.
1000+ successfully completed projects, including 200+ WP projects, speak for me. Links and reviews from my past clients available in my profile.
I am an individual, I am not a company in any meaning.
I need FTP access to start right now. And login/password into "wp-admin" Dashboard.
I can communicate via Freelancer.com.
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Sergey aka Takereal