• There is a forum post regarding this issue with a fix suggested by the plugin author.
    https://www.ronakg.com/discussions/#/discussion/463/oops-flickr-can039t-find-a-valid-callback-url-
    Unfortunately it didn’t work for me though I pasted the callback URL from my WordPress admin page. I then tried to add a comment to this forum post to ask if this should work pretty much instantly after I save my changes in Flickr or if it needs some time, but I couldn’t even sign in to his site to make a comment. Suposedly you can sign in using your Google credentials but when I try that I get an error message saying no account can be found.
    In short, way too much trouble to go through when there are other plugins that do the same thing.

    [Moderator Note: Please ensure that you are embedding links correctly in your posts.]

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