We plan to roll out a federated search in the Knowledge Center tomorrow (May 8). When you visit the Knowledge Center, you'll be able to search across the Knowledge Center, Zuora Community, and API Reference. The API Reference content source includes API operations of Billing, Revenue (formerly RevPro), and Collect.
We have optimized the search results for some of the most frequently searched terms, and will continue to improve the relevance of search results. If you have any questions or suggestions, or encounter any issues, please do not hesitate to let us know at: email@example.com.