The WSO2 integration runtime engine can fulfill various functions within your organization's architecture. It serves as both an Enterprise Service Bus (ESB) and a microservices integrator. When functioning as an ESB, it addresses your requirements for message routing, transformation, mediation, orchestration, and hosting of services and APIs. It employs various routing techniques, including header-based, content-based, rule-based, and priority-based routing. Furthermore, it effectively implements Enterprise Integration Patterns (EIPs) and offers capabilities for database and event stream integration. You can transform messages using XSLT 1.0/2.0, XPath, XQuery, and Smooks, alongside visual data mapping tools and connectors for transforming CSV, JSON, and XML formats. The engine is compatible with a wide range of data sources, including any relational database management system (RDBMS), CSV, Excel, ODS, Cassandra, and Google spreadsheets. Additionally, it supports the OData v4 protocol, making it suitable for various RDBMS and Cassandra data sources. Database compatibility extends to MSSQL, DB2, Oracle, OpenEdge, TerraData, MySQL, PostgreSQL/EnterpriseDB, H2, Derby, and any database that utilizes a JDBC driver, allowing for seamless nested queries across different data sources. The versatility and extensive support provided by the WSO2 integration engine empower organizations to streamline their integration processes effectively.