SAP S/4HANA Cloud
SAP Fiori Apps Library: https://fioriappslibrary.hana.ondemand.com/sap/fix/externalViewer/#
SAP Best Practices for SAP S/4HANA Cloud Public Edition:
Process Navigator - SAP for Me
Navigate to Finance → Subscription Billing and Revenue Management.
SAP S/4HANA Cloud for Contract Accounting and Invoicing
Convergent Invoicing: Convergent Invoicing | SAP Help Portal
Contract Accounting: Contract Accounting | SAP Help Portal