Microtransaction

a relatively inexpensive payment for part of a product or for an upgraded service or experience: often at the core of an alternative sales and revenue model for businesses to maximize profit with a very large volume of piecemeal or à la carte sales, rather than a single lump sum transaction for each full product sold:

Developers call this genre of game free-to-play, but the fact is you’ll never succeed without shelling out microtransactions at every level for the gear your character will need.

Sanskrit equivalent

सूक्ष्मव्यवहारः