How to build a single HTTP request from data within a collection in Microsoft Flow

A challenge in Microsoft Flow is to obtain specific data from a collection of objects (Like Dynamics 365 records) and use some data from those records within a single¬†HTTP request. Why not make multiple HTTP requests within the ‘Apply Each’ loop I hear you ask? Well my friend, because there could be 100 records or more, that’s 100 hits to an endpoint which is really unnecessary, time-consuming and prone to error. Best Practice is, if the scenario allows it, to send as few requests as possible.