For the described scenario, SAP Integration Suite and SAP Cloud ALM are optimal because:

SAP Integration Suite

It is designed for managing periodic data integrations, transformations, and forwarding to business partners.

The suite supports multi-system integrations, enabling data exchange between SAP S/4HANA (on-premise) and third-party APIs.

Built-in tools like Cloud Integration and Integration Advisor allow you to define mappings, transformations, and message flows efficiently with minimal resources and budget.

SAP Cloud ALM

This service supports centralized monitoring of integration scenarios, meeting the requirement for IT to oversee the process.

It provides pre-configured dashboards and alerts to manage and troubleshoot integrations in real time.

This combination ensures minimal maintenance costs and reduced complexity while offering a robust integration and monitoring framework.

References:

SAP Integration Suite

SAP Cloud ALM

 SAP Cloud Identity Services - Identity Authentication enables secure single sign-on (SSO) and user authentication for cloud-based applications.

 It is appropriate for enabling access to the custom application without adding users to the global directory. This ensures secure access while maintaining compliance with business and legal constraints.

 The service is designed for scenarios where temporary access or isolated authentication is required, as depicted in the provided diagram.(Reference: SAP Cloud Identity Services)

 SAP Alert Notification service for SAP BTP is specifically designed to monitor events such as expiring trust certificates. It sends alerts via various channels (e.g., email, webhook) before critical events occur.

 It can trigger workflows or actions automatically, helping the DevOps/Site Reliability Engineering team stay proactive about certificate expiration and reducing downtime or manual effort.

 This service integrates seamlessly with automation workflows like SAP Automation Pilot to address the issues in real time.(Reference: SAP Alert Notification Service)