When installing on WP Engine, you will need to contact WP Engine support and request that they turn off the “redirect_bots” setting, and purge the cache. If this setting is not disabled, then it will not be possible to send HTTP POSTs to your app, as the WP Engine server will intercept and stop them from succeeding. You’ll need to send a support ticket to WP Engine Support and ask them to allow your posts to contain variables.

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