VendorOrders: Unauthorized - Access to requested resource is denied.

[vikadis]

Hi,

I have the Orders endpoint working with Seller Central Sellers.

I replace the following credentials when switching to Vendor Central accounts & using the VendorOrders endpoint:
REFRESH_TOKEN
LWA_APP_ID
LWA_CLIENT_SECRET

I keep my AWS credentials:
AWS_ACCESS_KEY
AWS_SECRET_KEY
ARN_ROLE

However, when I run this code I get error.code 403 - Unauthorized & I'm not sure why. I'd really love to use this library for both sellers & vendors