Answer
IFS Cloud itself doesn't provide comprehensive external-call monitoring/auditing out of the box — the recommended approach is to place a dedicated API Management (gateway) solution in front of the IFS APIs you expose to third parties, and route external callers through that gateway rather than directly against IFS. That gives you proper governance capabilities (call-level monitoring, auditing, rate limiting, etc.) for every external invocation, successful or not, which isn't something IFS Cloud's own logging is built to provide on its own.