[#OSSL_CMP_HDR_get0_transactionID]
= OSSL_CMP_HDR_get0_transactionID
:mrdocs:

Return the transactionID from a CMP PKIHeader.

== Synopsis

Declared in `<openssl/cmp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:ASN1_OCTET_STRING.adoc[ASN1_OCTET_STRING]*
OSSL_CMP_HDR_get0_transactionID(xref:OSSL_CMP_PKIHEADER.adoc[OSSL_CMP_PKIHEADER] const* hdr);
----

== Return Value

Internal transactionID octet string, or NULL if absent.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *hdr*
| PKIHeader to query.
|===


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