In the V3 API, to Change Headers as Arguments Through RR Pairs see:
https://techdocs.broadcom.com/us/en/ca-enterprise-software/devops/devtest-solutions/10-7/using/using-the-apis/service-virtualization-api-v3.html#concept.dita_14d09617429fb8fc9c3abbbdc71919ab63171848_changeheadersrrpairs
But when sending a request with the specific headers, they are not matched by the VS.
Release : 10.7.2
In the DevTest Workstation, configure a Request Data Manager filter in the VS listen step to process the request and move the header metadata to the argument:
An enhancement to the functionality in the V3 API is planned.