References
In an event-driven architecture (EDA), several messaging patterns exist:
Point-to-Point # Enables direct communication between exactly two parties (sender and receiver) without intermediaries.
Publish-Subscribe # Multiple consumers subscribe to events; requires a broker/intermediary (like Event Mesh).
Message Queue # Relies on a queue as an intermediary between producer and consumer.
Event Sourcing # Refers to storing state changes as events, not a communication pattern.
Therefore, the only pattern allowing direct communication without an intermediary is Point-to-Point.

A Content Modifier is a step in an integration flow that allows you to modify the message header or body using expressions or constants. You can use a Content Modifier to delete namespaces from a message by using expressions that remove the namespace declarations or prefixes from the XML elements or attributes. For example, you can use the expression replace($body,"xmlns:ns[0-9]+=\"[^\"]+\"","") to remove all namespace declarations from the message body. An XSLT mapping is a step in an integration flow that allows you to transform the message body using an XSLT stylesheet. You can use an XSLT mapping to delete namespaces from a message by using XSLT instructions that strip or exclude the namespace information from the output XML document. For example, you can use the instruction <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" exclude-result-prefixes="#all"> to exclude all namespace prefixes from the output document. Reference: Content Modifier | SAP Help Portal, XSLT Mapping | SAP Help Portal

To connect an SAP backend system through the Cloud Connector with an API provider, you must use the on-premise connection type. The Cloud Connector acts as a link between SAP Integration Suite and on-premise systems, enabling secure and controlled access to the backend resources. The on-premise connection type allows you to specify the internal host and port of the backend system, as well as the virtual host and port that will be exposed to SAP Integration Suite. You can also define access control rules and protocols for the on-premise connection. Reference: Part 2: Connect to on-premise APIs from SAP Cloud Platform API Management Cloud Foundry Environment | SAP Blogs, How to configure SAP Cloud Connector & Create API using SCP API Management | SAP Blogs

In SAP Integration Suite, the component responsible for delivering Cloud Events to message queues is Event Mesh.
Event Mesh handles event-driven communication and manages message queues like emis-s4hana-uc123.
Process Integration (PI/PO) is on-premise middleware, not part of Integration Suite cloud services.
API Management handles APIs, not messaging events.
Open Connectors provides connectivity to third-party SaaS apps, not queue management.
Thus, the Cloud Event is delivered to the message queue via Event Mesh.

After creating an API in the API management capability within SAP Integration Suite using Edit in API Designer, the next step to consolidate the resources is to generate the server stubs. Server stubs are code snippets that implement the API operations on a server-side application. They can be generated in different languages and frameworks, such as Java, Node.js, Python, or Spring Boot. Generating server stubs can help you to quickly prototype and test your API functionality without writing much code. Reference: Create an API Using the API Designer | SAP Help Portal, Generate Server Stubs | SAP Tutorials