https://community.appian.com/discussions/f/user-interface/11472/how-to-provide-a-database-lookup-table-to-third-party-systemHi All, I have a requirement to process requests from system A to system B, here Appian acts as a mediator between system A &amp; system B, like validating and grouping the data, etc. There will be a huge data flow between system A and Appian(~40,000en-USTelligent Community 12https://community.appian.com/thread/50952?ContentTypeID=1Mon, 18 Dec 2017 18:11:19 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:6a85a3c7-5bfb-4244-b66d-42164cbf91ecaswinb608create a query entity of the table and pass that data as a json response to a web api<div style="clear:both;"></div>https://community.appian.com/thread/50504?ContentTypeID=1Thu, 30 Nov 2017 07:18:56 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:aec740f6-85ef-4f13-ae3c-975416f706f2aloks0189<p>Hi <a href="/members/someshwarp">someshwarp</a>  I believe, you system A is going to communicate Appian using Web API, in such case,  sending that huge amount of data to this service is never a good idea. </p> <p>However if that is your requirement you can send those data to Appian Web API in form of JSON through body, now Appian Web API will trigger a process and will pass entire body to the process through parameter, just to avoid huge data processing in Web API.</p> <p>You need to place parsing logic along with lookup operation and return the final response as outbound to the system B, in such case system B must have an API exposed which will be invoked by Appian once your request got processed.</p> <p>Hope this will give an overview to proceed further in order to achieve your requirement.</p><div style="clear:both;"></div>