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I installed the Videoclub theme on my WordPress site, but the featured images (thunmbnails) don't display on the site when I add an external link. When I upload the image to the library, it works. Can u Help me Please ?

Is there any website which helps selling such voucher codes securely? Original price is 19$, I would like to sell it, let's say, for only 10$. Both the seller, and the customer should be somehow ensured about that it is a valid voucher code. For example I could provide a screenshot image or...