See [calls](reference-v3/func-api/#calls-and-job-functions) and
[subcalls](reference-v3/func-req/#subcall-functions).
+The table below list the changes to apply:
+
+| Name in Version 2 | New name of Version 3
+|:----------------------:|:----------------------------------------------------:
+| afb_req_subcall | afb_req_subcall_legacy
+| afb_req_subcall_sync | afb_req_subcall_sync_legacy
+| afb_service_call | afb_service_call_legacy
+| afb_service_call_sync | afb_service_call_sync_legacy
+| afb_req_subcall_req | afb_req_subcall_req (same but obsolete)
+
Consider use of event handlers
------------------------------