amazon FBA box labels print with title

I am looking to create a project that utilizes Amazon Shipping labels API to generate shipping labels. I do not have a preference in terms of programming language selection for the project. My timeline for the project is 1 day. I need the API to be able to generate the amazon FBA box labels shipping labels with the product description on the label. Looking for pdf 4x6 labels. Attached is the label that i can generate from amazon but I would like the product title on there as well.



Information from the web -

I have no previous experience with Amazon MWS so maybe I'm not understanding the whole process flow. Now I'm trying to get labels for shipments I manually created over the Seller Central UI. Shipments I created are successfully fetched (Operation: getShipments) and now I have issue when getting the labels.

Here is my error response from API:

{'errors': [{'code': 'InvalidInput',
'message': 'Provided SellerCartonIds are not valid: [[FBAxxxxxxxxxU000001]] for Shipment: [FBAxxxxxxxxx]',
'details': ''}]}
If I print labels from UI FBAxxxxxxxxxU000001 label is printed in pdf - also found out about naming here.

In general, I don't know where to find parameter of package labels PackageLabelsToPrint from GetLabelsDocs, also I'm not sure if this parameter is same as cartonIdList parameter?

Here is response if you don't provide PackageLabelsToPrint query param in request:

{'errors': [{'code': 'InvalidInput',
'message': "1 validation error detected: Value null at 'cartonIdList' failed to satisfy constraint: Member must not be null",
'details': ''}]}
I spent a bit of time on this already and it gets a bit annoying.