Adding Dropbox dropin js using wp_enqueue_script

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<script>YOUR CUSTOM JS CODE</script> inline does the same exact thing as YOUR CUSTOM JS CODE placed in a js file.

I see no problem with the use of your app key in a js file. There is a few points to consider here though

  • If your script is dependent on the main jquery library, just remember to set the $deps when you enqueue your script, otherwise it will not work if it loads to early

  • Make use of conditional tags to load your script only on selected pages

This way I cannot see that your script should fail