Anticipated cost for Azure Maps Creator subscription with ? transactions

I am designing a web app and want to use the Azure Maps Creator to build an indoor map of a corporate campus, and update the styling of spaces on the map based on data from a third-party API. I hope to allow users to view their position within the building (with all the indoor-positioning-can't-rely-on-GPS challenges involved).

My question is, roughly how many transactions is our app likely to incur in order to display a map of an interior space where the styling may need to be reloaded? Will anything besides loading map tiles in this design incur a transaction cost? Do I need to be using the same subscription to load tiles as to create the indoor map? (I assume I do.)