It also issued a cease-and-desist order and directed the tech firm to modify its conduct within a defined timeline, which includes allowing mobile app developers to use third-party payment services on its app store.Last week, the antitrust regulator had imposed a penalty of Rs 1,338 crore on Google for abusing its dominant position in multiple categories related to Android mobile device ecosystem in the country.Further, app developers cannot, within an app, provide users with a direct link to a webpage containing an alternative payment method or use language that encourages a user to purchase the digital item outside of the app.If the app developers do not comply with GPBS, they are not permitted to list their apps on Play Store and stand to lose out on the vast pool of potential customers in the form of Android users.This amounts to imposition of discriminatory conditions as well as pricing as YouTube is not paying the service fee as being imposed on other apps covered in the GPBS requirements, the antitrust regulator said."