Metadata injection support is currently available in Java, for example 'https://github.com/pact-foundation/pact-plugins/blob/main/examples/gRPC/metadata/provider-jvm/server/src/test/java/io/pact/example/grpc/provider/PactVerificationTest.java#L60' . This function is needed in cases such as providing an authentication token to be able to verify the contract file using "verifyProvider" if the producer service is performing token authorization.

https://pact.canny.io/admin/board/feature-requests/p/add-metadata-injection-support-to-pact-js-verifier