MLS integration is a procedure for populating MLS property data feed (usually RETS / IDX ) into your website. 

Realtyna Property Listing can handle MLS integration and has customized packages specifically for this purpose. You can check our packages here : http://rpl.realtyna.com/RPL-Addons

RETS Data feed consist of XML/API access to updated property listing database and syncronization package is using server-to-

server technologies .   

There are IDX FTP raw data method which is not recommended if you have access to RETS feeds. 

diagram :

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Please check the MLS menu for more details .