public void setPrincipal(String principal) {
        this.principal = principal;
    }
<p>
The Amazon Web Services service or identity that will have its CA permissions revoked. At this time, the only
valid service principal is <code>acm.amazonaws.com</code>
</p>

@param principal
       The Amazon Web Services service or identity that will have its CA permissions revoked. At this time, the
       only valid service principal is <code>acm.amazonaws.com</code>
aws-java-sdk-acmpca/src/main/java/com/amazonaws/services/acmpca/model/DeletePermissionRequest.java