If a customer wants to develop their own custom application and integrate it with SAP...

 SAP Business Application Studio and SAP Build are two tools that enable customers to develop their own custom applications and integrate them with SAP S/4HANA Cloud Public Edition. SAP Business Application Studio is a cloud-based development environment that offers both low-code and full-stack development capabilities. It supports various SAP technologies and frameworks, such as SAP Fiori, SAPUI5, SAP Cloud Application Programming Model, and SAP Cloud SDK. SAP Build is a cloud-based prototyping and user research tool that helps customers to design and test user interfaces for their applications. It provides a drag-and-drop interface, a library of UI components, and integration with SAP Web IDE and SAP Fiori Launchpad. Both tools are part of the SAP Extension Suite, which provides a range of services and capabilities to extend SAP applications and processes. References = Create a SAP Fiori App and Deploy it to SAP S/4HANA Cloud > Create a SAP Fiori App and Deploy it to SAP S/4HANA Cloud. Create a SAP Fiori App and Deploy it to SAP S/4HANA Cloud > Create a SAP Fiori App and Deploy it to SAP S/4HANA Cloud. Low-code/No-code | SAP Developers.