PDF

I am trying to debug an issue with injecting data via Apex SDK into a merge field to a specific PDF form and it's failing. It is working on other forms we have.  Are there some known incompatibilities with certain types of PDF fields?  Or is there a log to see why merging is failing?  

For example, I noticed that this particular form has the same name for a few fields - i.e. mergeField - but Adobe Acrobat also shows mergeField#1, mergeField#2, mergefield#3.  Is it supported to reference mergeField#1, etc or does each field need a unique name?

We have everything working great with Laserfiche Forms, where after the signatures are completed, OneSpan knows to assign a certain metadata field to the specified document to indicate to the corresponding workflow that processing can continue. We have no issues on that end. However, when I try to use the integration with a document instead of through Forms, this is what happens. See screenshot below for some visual assistance:

Hello,

I am having some issues when trying to add a document as binary data to a package

Our pdf's are in base64 data so we need to convert this data to binary data but we always get this error when we are trying to create new package(POST /api/packages):