Intel does not recommend a particular method to provision secrets using DCAP, but it can be accomplished using Transport Layer Security (TLS).
Unable to determine how to provision secrets from the service provider to the enclave after the quote has been verified.
For Intel SGX DCAP*, Intel provides the QuoteGeneration* and QuoteVerification* components and leaves it up to the solution developer to choose their own mechanism for exchanging secrets. Most developers use Transport Layer Security (TLS) terminating inside the enclave, but there are other ways it could be done.