Here's a Python SP-API library. https://pypi.org/project/python-amazon-sp-api/

The author indicates he is looking for freelance work.

And here is what Chilkat has to say/offer:

https://cknotes.com/chilkat-for-amazon-marketplace-sp-api/

Basically Chilkat will work out the API (and then add it as one of the hundreds of examples for this controls) so long as you provide the sandbox.

Hank

>Hello -
>
>I'm looking for help to transition our VFP app for Amazon MWS XML data feeds to the new SP-API in JSON. We can manage the JSNO feeds, but are Looking for developer that can help us get the authentication element established.
>
>Thanks,
>Margaret