Global Pay‑As‑You‑Go Billing Market Size, Share, Growth Analysis By Deployment (Cloud, On‑premise), By Organization Size (Large Enterprises, SMEs), By End‑User (IT & Telecom, BFSI, Retail & E‑commerce, Healthcare, Utilities, Others), By Region and Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Statistics, Trends and Forecast 2025-2034