API - Add external ref to document in agreement / fileInfo label property

Hi,

I'm using the Adobe Sign REST API to create agreements and I'd like to add an external reference to each document in an agreement.

I'm using the

POST /agreements

call and I can see one of the arguments I can provide in the fileInfo object is 'label' which would seem to do the job. However when I create an agreement using the label argument looking something like this:

....

"fileInfos": [

   {

"label":"X1234",

"transientDocumentId":"3AAABLblqZhBI1QTigTUIuqwncze-B9eCP2nPMed5PccdIU1T-w6.............."}

  ],

....

The agreement gets created with the document but I can't where the label is stored or how to retrieve it.

Any help would be appreciated.

Nick