Who pays Othc?

Who, exactly, is responsible for paying Othc? Is it the users of the platform, the service providers, or some other entity entirely? And how does the payment process work? Are there any fees associated with using Othc, and if so, what are they? Clarifying these details would be essential for anyone considering using Othc, as it would help them understand the costs and responsibilities involved in utilizing the service. So, who ultimately foots the bill for Othc, and how does the payment structure work?