Spring Integration querying multiple api's and aggregating the response

I'm a newbie to Spring Integration and am looking for a few pointers regarding how I could use it as follows:

Let's say I get a request from a client which for example is looking for a price comparison for some widget. On receipt of this request I would like to call out to multiple different company api's to get different prices and aggregate the each response (different response formats) before returning to the client.

I was just wondering which patterns I could use to do this