Deliver an image to the signed-in buyer, spending the image's price in credits (price.credits in search_images and get_image — often 1, sometimes more) if they do not already own it. Credits buy the personal license only; the commercial license is bought with create_checkout, and this then delivers it. If they DO already own it this is free and always will be — use it freely for re-downloads, and for a fresh download link. The purchased image comes as two links, both as the photographer framed it, uncropped: download_url, 2560px WebP on the long side, which a phone or desktop fits to its own screen as a wallpaper; and print_url, the original file at full resolution (often 10–35 MB), for printing (null when unavailable). Give the person both; they expire at download_expires_at, a day out, and their account page (account_url in get_account) lists every image they own with fresh links. The picture returned inline is a 1200px copy to show them what they got. Pass full_image: true to have the full file inline as well — often 1–3 MB — only if you can accept a result that large and save it yourself. Confirm the price with the person before spending credits. An image bought wholly with free-trial credits is the screen file only: print_url is null, print_included false, and print_offer says what the print costs — the full price again, in paid credits. With the person's agreement, call again with buy_print: true to spend them (or create_checkout kind=one_off to pay by card). After a card checkout for this image it spends nothing: it answers payment_pending until the payment lands, then delivers. Requires sign-in.