Which CoreIQ APIs stay up until the old path is retired?

We are replacing one claims process. Which host APIs should stay in place so the rest of the application keeps running?

Keep system APIs on the CICS programs, IMS transactions, DB2 tables, and VSAM datasets the remaining paths still use. Bulk populate and dataset APIs are the coexistence layer, not the new process. Retire a published API when callers have moved, not when the spec for one process is approved. Dataset CDC can inform the new service without becoming a second writer.