How to get related post id using only a custom field value?

  • I would like to update a post via the update_post_meta function. The only problem is that I don’t have the post ID in this case but I do have a unique value of a posts custom field from a csv file that I’m importing.

    In short, how can I do a query for a custom field containing X and return the related post ID for use in a variable?

    Thanks in advance for any help!

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