OSSL_CMP_HDR_get0_transactionID
tid = OSSL_CMP_HDR_get0_transactionID(hdr);
ASN1_OCTET_STRING *OSSL_CMP_HDR_get0_transactionID(const OSSL_CMP_PKIHEADER *hdr);
header_transactionID = OSSL_CMP_HDR_get0_transactionID(fixture->hdr);
const ASN1_OCTET_STRING *tid = OSSL_CMP_HDR_get0_transactionID(hdr);