You can use your external-server Cron Jobs to import yours listings automatically to your WordPress e.g. once per day at midnight. 

1. Register - https://cron-job.org/

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2. Check your email and activate account

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3. You will see message "Your account has been activated successfully". Click login link and login

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4. Visit Cron Jobs and Click "Create cronjob"

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5.  Visit MyHome IDX Broker > "Import listings assigned to your account" page

Copy first link

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Add it here and set once per day:

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Click "Create cronjob"

mceclip0.pngTo make it works correctly you need to add second cronjob. Click "Create cronjob" again

 

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Copy second link

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and schedule it every 1 minute 

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Listings will be automatically synchronized every 1 day.